The number of engines owned per fire department was obtained from a random sampl
ID: 2378194 • Letter: T
Question
The number of engines owned per fire department was obtained from a random sample taken from the profiles of fire departments from across the United States. The results are as follows:
Use the point data to find a point estimate for the standard deviation.
State the null hypothesis H0 and the alternative hypothesis Ha that would be used to test the following claim:
A chicken farmer at Best Broilers claims that the chickens have a mean weight of 56 ounces.
Many biologists and anthropologist claim that 10 percent of all children conceived in the context of a marriage have been fathered by someone from outside the couple.
In this situation, the standard deviation from samples of 225 births is 0.02. If the sample size were decreased, the standard deviation would be
The probability of birth by Caesarean in the U.S. is 0.30
If the probability of Caesarean birth is 0.30, and 140 in a sample of 500 births are Caesarean, which of these numbers is n?
This graph shows the distribution of ACT scores for a population of students.
Which of these is your best guess for the probability of a score being greater than 30?
Online interviews of 1500 parents with children under the age of eight found the proportion who read to their children at least 20 minutes a day to be 0.78. Suppose a reporter would like to claim that more than three-fourths (0.75) of all parents with children under eight read to them at least twenty minutes daily.
What notation is used for the number 0.75?
A Type I Error is rejecting the null hypothesis, even though it is true; a Type II Error is failing to reject the null hypothesis, even though it is false.
Merck developed an AIDS vaccine that showed promise in initial tests. Unfortunately, in a subsequent test conducted internationally on a large group of volunteers, those vaccinated were no less likely to become infected than those who were not vaccinated. Apparently, Merck
29 8 7 33 21 26 6 11 4 54 7 4 ACT Score Analysis of Variance Analysis of Variance Analysis of VarianceExplanation / Answer
1)A) Yes
2)
C) Randomness
3)
B) 500
4)
B) Approximately 15.5
5)
A) H0 = ? = 56 vs Ha: ? ? 56
6) C) Independent. The two samples are from two separate and different sets of students
7)
B) Distribution of sample proportion, when the population proportion is 0.25
8)B) Larger
9)
C) 500
10)
B) 0.036
11)
B) p?
12)A) a Type I Error
13)
B) 4
14)
B) Two-sample study
15)
B) include individuals spanning a wide range of ages
16)
B) one of the resorts was much more expensive than the other two
17)
B) ?1 = ?2 = ?3
18)
C) Not all three population means are the same
19)
A) Z-test
20)
B) when the sample population is normally distributed
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