TRUE/FALSE. Write \'T\' if the statement is true and \'F\' if the statement is f
ID: 1214310 • Letter: T
Question
TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false.
17.When performing a hypothesis test to compare two or more population proportions, the expected frequencies must always be integer values.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
18.The frequencies refer to the frequencies that are most likely to occur if the null hypothesis is true when performing a hypothesis test comparing two or more population proportions.
expected B) observed C) cumulative D) relative
19.Nationwide Insurance would like to perform a chi-square test to investigate whether a difference exists in the proportion of male and female teenagers who text while they drive. A random sample of 80 male teenagers found that 50 indicated they texted while driving. A random sample of 120 female teenagers found that 65 indicated they texted while driving. The expected frequency of female teenagers who text is .
A) 65 B) 69 C) 55 D) 51
20.When performing a hypothesis test to compare two or more population proportions, the test statistic follows the .
A.Student's t-distribution B) normal distribu C) F-distribution D) chi-square distribution
21.The Department of Transportation would like to investigate if a difference exists in the proportion of flights that arrive on-time between Alaska Airlines, Delta Airlines, Southwest Airlines, and United Airlines. The following data represent the number of on-time flights from random samples taken from each airline.
Alaska
Delta
Southwest
United
Number On-time
90
95
85
60
Sample Size
100
120
100
80
The expected frequency of on-time flights from the Southwest sample is .
A) 66 B) 99 C) 90 D) 82.5
TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false.
22.The null hypothesis for a chi-square goodness-of-fit test always states that the stated distribution is followed.
Alaska
Delta
Southwest
United
Number On-time
90
95
85
60
Sample Size
100
120
100
80
Explanation / Answer
17) F expected frequency can have any value
18) A Expected
19) total teenagers who text = 50+65=115, sample= 80+120=200, probability=115/200=0.575
female teenagers who text= 0.575*120=69
20) normal distribution (Z statistic)
21)total ontime flights= 330, sample =400. so probability=330/400=.825
expected for southwest= 0.825*100=82.5
22)T
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