QUESTION 1

1. Determine the critical valuez_/2that corresponds to the given level of confidence.
3. 86%
4. 1.080.811.161.48

1 points

QUESTION 2

1. Determine the critical valuez_/2that corresponds to the given level of confidence.
3. 97%
4. 0.832.171.921.88

1 points

QUESTION 3

1. Determineandfrom the given parameters of the population and the sample size. Round the answer to the nearest thousandth where appropriate.
3. = 38, = 24, n = 16
4. = 38, = 6= 38, = 24= 38, = 1.5= 9.5, = 6

1 points

QUESTION 4

1. Find the critical value(s).
3. Determine the critical value for a right-tailed test of a population standard deviation with 16 degrees of freedom at thelevel of significance.
4. 24.99626.2967.96234.267

1 points

QUESTION 5

1. Find the critical value.
3. Determine the critical value for a right-tailed test of a population mean at the = 0.005 level of significance with 28 degrees of freedom.
4. 2.7711.701-2.7632.763

1 points

QUESTION 6

1. Find the t-value.
3. Find the critical t-value that corresponds to 90% confidence and n = 15.
4. 2.1451.7612.6241.345

1 points

QUESTION 7

1. Find the t-value.
3. Find the t-value such that the area in the right tail is 0.005 with 28 degrees of freedom.
4. 2.7632.7711.701-2.763

1 points

QUESTION 8

1. Provide an appropriate response. Round the test statistic to the nearest thousandth.
3. Compute the standardized test statistic, ², to test the claim ²= 25.8 if n = 12, s²= 21.6, and
4. 0.4929.20912.96118.490

1 points

QUESTION 9

1. Provide an appropriate response. Round the test statistic to the nearest thousandth.
3. Compute the standardized test statistic, ², to test the claim ² 16.2 if n = 15, s²= 13.5, and
4. 23.8918.71311.66712.823

1 points

QUESTION 10

1. Provide an appropriate response.
3. A candidate for state representative of a certain state claims to be favored by more than half of the voters. If a hypothesis test is performed, how should you interpret a decision that rejects the null hypothesis?
4. There is not sufficient evidence to support the claim p = 0.5.There is sufficient evidence to reject the claim p =0.5.There is not sufficient evidence to reject the claim p = 0.5.There is sufficient evidence to support the claim p = 0.5.

1 points

QUESTION 11

1. Provide an appropriate response.
3. A local bank needs information concerning the savings account balances of its customers. A random sample of 15 accounts was checked. The mean balance was $686.75 with a standard deviation of $256.20. Find a 98% confidence interval for the true mean. Assume that the account balances are normally distributed. Round to the nearest cent.
4. ($238.23, $326.41)($487.31, $563.80)($326.21, $437.90)($513.17, $860.33)

1 points

QUESTION 12

1. Provide an appropriate response.
3. A researcher at a major clinic wishes to estimate the proportion of the adult population of the United States that has sleep deprivation. What size sample should be obtained in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 5%?
4. 10271385769

1 points

QUESTION 13

1. Provide an appropriate response.
3. A student randomly selects 10 paperbacks at a store. The mean price is $8.75 with a standard deviation of $1.50. Construct a 95% confidence interval for the population standard deviation, . Assume the data are normally distributed.
4. ($1.76, $3.10)($0.43, $1.32)($1.03, $2.74)($1.43, $2.70)

1 points

QUESTION 14

1. Provide an appropriate response.
3. Construct a 95% confidence interval for the population mean, . Assume the population has a normal distribution. A sample of 20 part-time workers had mean annual earnings of $3120 with a standard deviation of $677. Round to the nearest dollar.
4. ($2657, $2891)($2803, $3437)($1324, $1567)($2135, $2567)

1 points

QUESTION 15

1. Provide an appropriate response.
3. Construct a 95% confidence interval for the population standard deviation of a random sample of 15 crates which have a mean weight of 165.2 pounds and a standard deviation of 12.2 pounds. Assume the population is normally distributed.
4. (9.4, 17.8)(2.6, 5.5)(8.9, 19.2)(79.8, 370.2)

1 points

QUESTION 16

1. Provide an appropriate response.
3. Determine the point estimate of the population mean and margin of error for the confidence interval with lower bound 14 and upper bound: 26.
4. = 20, E = 12= 14, E = 12= 20, E = 6= 26, E = 6

1 points

QUESTION 17

1. Provide an appropriate response.
3. Find the critical value for a left-tailed test with = 0.05.
4. -1.28-1.645-2.33-1.96

1 points

QUESTION 18

1. Provide an appropriate response.
3. Find the critical values,and, for 95% confidence and n = 12.
4. 3.816 and 21.9202.603 and 19.6754.575 and 26.7573.053 and 24.725

1 points

QUESTION 19

1. Provide an appropriate response.
3. Find the standardized test statistic t for a sample with n = 12,= 13.2, s = 2.2, and = 0.01 ifRound your answer to three decimal places.
4. 2.1321.9911.8902.001

1 points

QUESTION 20

1. Provide an appropriate response.
3. Find the standardized test statistic t for a sample with n = 10,= 16.2, s = 1.3, andifRound your answer to three decimal places.
4. -2.617-2.189-3.010-3.186

1 points

QUESTION 21

1. Provide an appropriate response.
3. If we do not reject the null hypothesis when the null hypothesis is in error, then we have made a
4. Type II errorType errorType I errorCorrect decision

1 points

QUESTION 22

1. Provide an appropriate response.
3. If we reject the null hypothesis when the null hypothesis is true, then we have made a
4. Type errorCorrect decisionType II errorType I error

1 points

QUESTION 23

1. Provide an appropriate response.
3. In a random sample of 60 dog owners enrolled in obedience training, it was determined that the mean amount of money spent per owner was $109.33 per class. Assuming the population standard deviation of the amount spent per owner is $12, construct and interpret a 95% confidence interval for the mean amount spent per owner for an obedience class.
4. ($106.29, $112.37); we are 95% confident that the mean amount spent per dog owner for a single obedience class is between $106.29 and $112.37.($106.74, $111.92); we are 95% confident that the mean amount spent per dog owner for a single obedience class is between $106.74 and $111.92.($106.23, $112.43); we are 95% confident that the mean amount spent per dog owner for a single obedience class is between $106.23 and $112.43.($106.78, $111.88); we are 95% confident that the mean amount spent per dog owner for a single obedience class is between $106.78 and $111.88.

1 points

QUESTION 24

1. Provide an appropriate response.
3. Suppose a population has a mean of 7 for some characteristic of interest and a standard deviation of 9.6. A sample is drawn from this population of size 64. What is the standard error of the mean?
4. 3.30.150.71.2

1 points

QUESTION 25

1. Provide an appropriate response.
3. The business college wants to determine the proportion of business students who have extended time between classes. If the proportion differs from 30%, then the lab will modify a proposed enlargement of its facilities. Suppose a hypothesis test is conducted and the test statistic is 2.5. Find the P-value for a two-tailed test of hypothesis.
4. 0.050.10

1 points

QUESTION 26

1. Provide an appropriate response.
3. The mean age of professors at a university is 53.9 years. If a hypothesis test is performed, how should you interpret a decision that fails to reject the null hypothesis?
4. There is sufficient evidence to reject the claim = 53.9.There is not sufficient evidence to reject the claim = 53.9.There is sufficient evidence to support the claim = 53.9.There is not sufficient evidence to support the claim = 53.9.

1 points

QUESTION 27

1. The null and alternative hypotheses are given. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed and the parameter that is being tested.
3. H₀: = 9.3
4. H₁: 9.3
5. Two-tailed,Right-tailed, Left-tailed,Two-tailed,