Question

A sample of 10-year-old children found that they receive the following weekly allowances: $6, $1, $2, $10, $4, $3, $9. What is the sample mean?
Answer choices:
$4, $5, $6, $7

114 out of 150 customers at a bank said that they prefer to use ATMs rather than
going to a live teller. What is the sample proportion of bank customers who prefer to use ATMs?
Answer choices:
0.68, 0.72, 0.76, 0.80

Which sample size would give the best estimate of the population mean?
Answer choices:
18, 30, 45, 60

Which sample size is large enough to use a normal distribution as an approximation of the sampling distribution?
Answer choices:
7, 19, 28, 35

Many samples of the same size are taken from a population with a population
proportion of 0.75. Which sample sizes, n, would be too small to use a normal curve to approximate the sampling distribution? Select all that apply.
Answer choices:
18, 30, 45, 60

Many samples of the same size are taken from a population with a population
proportion of 0.3. Which sample sizes, n, would be too small to use a normal curve to approximate the sampling distribution? Select all that apply.
Answer choices:
32, 48, 56, 68

Suppose random samples of 48 are taken from a distribution that is skewed right. The sampling distribution will be which of the following?
Answer choices:
Skewed left , Skewed right , Non-normal , Normal

Many samples of 63 employees are taken from a population, and the average number of sick days taken by an employee per year is calculated for each sample. If the mean for the population is 4.1 sick days, what will be the approximate value of the mean of the sample means?
Answer choices:
4.1 sick days, 4.5 sick days, 4.9 sick days, 5.3 sick days

A sample of 90 people is taken from a
population. The standard deviation of the sample is 34.4. What is the approximate value of the standard error of the sampling
distribution? Round your answer to two
decimal places.
Answer choices:
2.53, 3.63, 4.73, 5.83

45% of all marathon runners also enjoy biking. If many samples of 60 marathon
runners are taken and the proportion of those who also enjoy biking is calculated for each sample, what will be the approximate value of the mean of the sample proportions?
Answer choices:
0.30, 0.45, 0.60, 0.75

A sample of 88 items is taken from a population. The sample proportion is 0.52. What is the standard error of the sampling distribution? Round your answer to two decimal places.
Answer choices:
0.05, 0.10, 0.15, 0.20

The mean of a distribution of sample proportions is 0.13, and the standard error is 0.02. What two values will 95% of the sample proportions fall between?
Answer choices:
0.11 and 0.15 , 0.09 and 0.17 , 0.07 and 0.19 , 0.05 and 0.21

Given the following information, determine the confidence interval. n = 49; x = 405; s = 21; CL = 99.7%
Answer choices:
(402, 408), (401, 409), (399, 411), (396, 414)

A nonprofit organization commissions a study to find the average cost of a college textbook. After looking at 121 college
textbooks, it finds that the average cost is $52.00, with a standard deviation of $5.50. What is the 95% confidence interval for the average cost of a college textbook?
Answer choices:
($51, $53), ($50, $54), ($49, $55), ($48, $56)

Given the following information, determine the confidence interval.  n = 81; x = 270; s = 72; CL = 90%
Answer choices: (250.84, 289.16), (253.84, 286.16), (256.84, 283.16), (259.84, 280.16)