Mathematics problem solving
178175 questions • Page 145 / 3564
1. A random sample of n = 13 observations was selected from a normal population.
1. A random sample of n = 13 observations was selected from a normal population. The sample mean and variance were x = 3.98 and s2 = 0.3215. Find a 90% confidence interval for the…
1. A random sample of size 150 taken from a population yields a proportion equal
1. A random sample of size 150 taken from a population yields a proportion equal to 0.35. a. Determine if the sample size is large enough so that the sampl…
1. A random sample of size 150 taken from a population yields a proportion equal
1. A random sample of size 150 taken from a population yields a proportion equal to 0.35. a. Determine if the sample size is large enough so that the sampl…
1. A rapid-transit system employing single vehicles is scheduled at constant hea
1. A rapid-transit system employing single vehicles is scheduled at constant headways. For safety regime b (Table 3.2.1), plot the relationship between spacing in feet (ft) and sp…
1. A real estate agent has collected a random sample of 75 houses that were rece
1. A real estate agent has collected a random sample of 75 houses that were recently sold in a suburban community. She is particularly interested in comparing the appraised …
1. A rearcher wanted to determine if the average sizesize of farms in two counti
1. A rearcher wanted to determine if the average sizesize of farms in two counties in Pennsylvania were different. Hesamples 8 farms n Indiana county and dtermines the average siz…
1. A rearcher wanted to determine if the average sizesize of farms in two counti
1. A rearcher wanted to determine if the average sizesize of farms in two counties in Pennsylvania were different. Hesamples 8 farms n Indiana county and dtermines the average siz…
1. A reasher wanted to determine if the average size of farmsin two countries in
1. A reasher wanted to determine if the average size of farmsin two countries in Pennsylvania were different. He samples 8 farmsin Indiana County and determines the average size o…
1. A reasher wanted to determine if the average size of farmsin two countries in
1. A reasher wanted to determine if the average size of farmsin two countries in Pennsylvania were different. He samples 8 farmsin Indiana County and determines the average size o…
1. A recent baseball IQ test was given to 250 random Connecticut baseball fans.
1. A recent baseball IQ test was given to 250 random Connecticut baseball fans. The scores were classified as Low (little or no baseball knowledge), Intermediate (moderate basebal…
1. A recent report stated \"Based on a sample of 160 truck drivers, there is evi
1. A recent report stated "Based on a sample of 160 truck drivers, there is evidence to indicate that, on average, independent truck drivers ean more than company-hired truck stat…
1. A recent survey discovered 315 people like Honda and 218 like Toyota. Of thos
1. A recent survey discovered 315 people like Honda and 218 like Toyota. Of those surveyed, 103 stated they liked both. How many total people were surveyed? Be sure to state/show …
1. A recent survey found that 55% of pet owners admit to talking to their pet on
1. A recent survey found that 55% of pet owners admit to talking to their pet on the phone or leaving messages for the pet on the answering machine. If 300 pet owners are randomly…
1. A rectangular storage container with an open top is to have a volume of 20 cu
1. A rectangular storage container with an open top is to have a volume of 20 cubic meters. The length of its base is twice the width. Material for the base costs 11 dollars per s…
1. A rectangular swimming pool is 4 feet deep, 75 feet long, and 25 feet wide. I
1. A rectangular swimming pool is 4 feet deep, 75 feet long, and 25 feet wide. It is completely filled with water. a. What is the hydrostatic force on the bottom of the pool? b. W…
1. A regression analysis between sales (in $1000) and advertising (in $) resulte
1. A regression analysis between sales (in $1000) and advertising (in $) resulted in the following least squares line: y 80,000+5x. This implies that an: a. increase of $1 in adve…
1. A regression analysis yields the following information: 0.0, 4.05 6.842, 9.49
1. A regression analysis yields the following information: 0.0, 4.05 6.842, 9.497 4.15, 12.25 2.67, 5.33 2. A researcher is studying the relationship between 10 different variable…
1. A rehabilitation counselor used the number of visitors that patients receive
1. A rehabilitation counselor used the number of visitors that patients receive over the course of a week in the hospital to predict their daily levels of positive mood. The slope…
1. A repeated-measures research study comparing three treatments with a sample o
1. A repeated-measures research study comparing three treatments with a sample of n = 10 participants produced an F-ratio of F = 3.95. Based on this result, which of the following…
1. A report states that 46% of home owners have a vegetable garden. How large a
1. A report states that 46% of home owners have a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to withi…
1. A research facility has a position open. The probability that an applicant ha
1. A research facility has a position open. The probability that an applicant has had lab safety training is 0.68. The probability tht an applicant has had hazardous material trai…
1. A research firm tests the miles-per-gallon characteristics of three brands of
1. A research firm tests the miles-per-gallon characteristics of three brands of gasoline. Automobiles were randomly subjected to treatments and the results of the experiment…
1. A research firm tests the miles-per-gallon characteristics of three brands of
1. A research firm tests the miles-per-gallon characteristics of three brands of gasoline. Automobiles were randomly subjected to treatments and the results of the experiment…
1. A research report concludes that there are significant differences among trea
1. A research report concludes that there are significant differences among treatments, with “F(2, 24) = 8.62, p < .01.” If the same number of participants was used in all of t…
1. A research wants to study the effect of the TV ads to the candidate’s support
1. A research wants to study the effect of the TV ads to the candidate’s supporting rate. Let p be thesupporting rate. He wanted to see whether the supporting rate was increased o…
1. A researcher believed that there was a difference in the amount of time boys
1. A researcher believed that there was a difference in the amount of time boys and girls in 7th grade exercise. Which of the following was the null hypothesis? a. The amount of h…
1. A researcher believes that the average size of farms in the U.S. has increase
1. A researcher believes that the average size of farms in the U.S. has increased from the 2002 mean of 471 acres. She took a sample of 23 farms in 2011 to test her belief and fou…
1. A researcher claims that the yield in bushes per acre is related to the avera
1. A researcher claims that the yield in bushes per acre is related to the average temperature. Interpret the coefficient of determination if he collects data on 6 different regio…
1. A researcher claims that the yield in bushes per acre is related to the avera
1. A researcher claims that the yield in bushes per acre is related to the average temperature. Interpret the coefficient of determination if he collects data on 6 different regio…
1. A researcher collects a sample of 300 people and measures them on the measure
1. A researcher collects a sample of 300 people and measures them on the measurement variables number of hours of TV watched per week and statistics course grade. He calculates a …
1. A researcher compares men and women on 100 different variables using a two- s
1. A researcher compares men and women on 100 different variables using a two- sample t-test. He sets the level of significance to .05 and then carries out 100 independent t-tests…
1. A researcher compares the frequency of participants who sleep primarily on th
1. A researcher compares the frequency of participants who sleep primarily on their stomach, back, or side during the night. What is the critical value for a chi-square goodness-o…
1. A researcher computes a 2 × 3 between-subjects ANOVA in which 6 participants
1. A researcher computes a 2 × 3 between-subjects ANOVA in which 6 participants are observed in each cell. What are the degrees of freedom error for this study? a. 71 b. 60 c. 30 …
1. A researcher computes a 2 × 4 between-subjects ANOVA. What are the degrees of
1. A researcher computes a 2 × 4 between-subjects ANOVA. What are the degrees of freedom for Factor B for this study? a. 2 b. 3 c. 4 d. 8 2. A researcher records the amount of tim…
1. A researcher computes a 3 × 4 between-subjects ANOVA. What are the degrees of
1. A researcher computes a 3 × 4 between-subjects ANOVA. What are the degrees of freedom for Factor A for this study? a. 2 b. 3 c. 6 d. 12 2. For the effects of a two-way between-…
1. A researcher computes the following one-way between-subjects ANOVA table for
1. A researcher computes the following one-way between-subjects ANOVA table for a study where k = 3 and n = 12. State the decision at a .05 level of significance. (Hint: Complete …
1. A researcher conducted an experiment to determine the effect of the lecturer’
1. A researcher conducted an experiment to determine the effect of the lecturer’s age on student preferences to hear her lecture. In a regular classroom situation, 30 students wer…
1. A researcher conducts a hypothesis test on a population proportion. Her null
1. A researcher conducts a hypothesis test on a population proportion. Her null and alternative hypothesis are H0 : p = 0.4 and Ha : p < 0.4 . The test statistic and p-value fo…
1. A researcher conducts a hypothesis test using a sample from an unknown popula
1. A researcher conducts a hypothesis test using a sample from an unknown population. If the t statistic has df = 35, how many individuals were in the sample? A. n = 35 B. It cann…
1. A researcher conducts a study to determine if moderate exercise (weekly speed
1. A researcher conducts a study to determine if moderate exercise (weekly speed walking) is effective for treating depression. The researcher recruited ten volunteers with clinic…
1. A researcher conducts a study to determine if moderate exercise (weekly speed
1. A researcher conducts a study to determine if moderate exercise (weekly speed walking) is effective for treating depression. The researcher recruited ten volunteers with clinic…
1. A researcher conducts a survey of registered voters and divides the populatio
1. A researcher conducts a survey of registered voters and divides the population by township before obtaining a sample. This sampling technique is called: Select one: a. Convenie…
1. A researcher conducts a within-subjects design and notes that scores increase
1. A researcher conducts a within-subjects design and notes that scores increased at each level of the factor for all participants. Based on this description, does this test have …
1. A researcher conducts a within-subjects design and notes that scores increase
1. A researcher conducts a within-subjects design and notes that scores increased at each level of the factor for all participants. Based on this description, does this test have …
1. A researcher conducts a within-subjects design and notes that scores increase
1. A researcher conducts a within-subjects design and notes that scores increased at each level of the factor for all participants. Based on this description, does this test have …
1. A researcher conducts a within-subjects design and notes that scores increase
1. A researcher conducts a within-subjects design and notes that scores increased at each level of the factor for all participants. Based on this description, does this test have …
1. A researcher conducts an experiment comparing four treatment conditions with
1. A researcher conducts an experiment comparing four treatment conditions with 20 scores in each treatment condition (so the dataset includes a total of 80 scores). a. If the exp…
1. A researcher conducts an experiment comparing four treatment conditions with
1. A researcher conducts an experiment comparing four treatment conditions with 20 scores in each treatment condition (so the dataset includes a total of 80 scores). a. If the exp…
1. A researcher for the American Booksellers Association wants to know if retail
1. A researcher for the American Booksellers Association wants to know if retail sales per square foot is related to serving coffee or snacks on the premises. She examines a datab…
1. A researcher for the American Booksellers Association wants to know if retail
1. A researcher for the American Booksellers Association wants to know if retail sales per square foot is related to serving coffee or snacks on the premises. She examines a datab…
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Mathematics problem solving
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