Question 1

Classify the data as either discrete or continuous.

The number of freshmen entering college in a certain year is 621.

Group of answer choices

a.Discrete

b. Continuous

2.Classify the data as either discrete or continuous.

The average height of all freshmen entering college in a certain year is 68.4 inches.

Group of answer choices

a. Discrete

b. Continuous

Question 7

A sample mean, sample size, and population standard deviation are given. Use the one-mean z-test to perform the required hypothesis test at the given significance level. Use the critical -value approach.

= 54, n = 38, = 5.6, H0: = 56; Ha: < 56, = 0.05

Group of answer choices

z = -2.20; critical value = -1.645; do not reject H0

z = -0.36; critical value = -1.645; do not reject H0

z = -2.20; critical value = -1.96; reject H0

z = -2.20; critical value = -1.645; reject H0

QUESTION 8

A sample mean, sample size, and population standard deviation are given. Use the one-mean z-test to perform the required hypothesis test at the given significance level. Use the critical -value approach.

= 51, n = 45 , = 3.6, H0: = 50; Ha: > 50, = 0.01

Group of answer choices

z = 1.86; critical value = 2.33; reject H0

z = 1.86; critical value = 1.33; reject H0

z = 0.28; critical value = 2.33; do not reject H0

z = 1.86; critical value = 2.33; do not reject H0

Question 9

A sample mean, sample size, and population standard deviation are given. Use the one-mean z-test to perform the required hypothesis test at the given significance level. Use the critical -value approach.

= 25, n = 40, = 1.5, H0: = 23; Ha: 23, = 0.05

Group of answer choices

z = 8.43; critical values = 1.96; do not reject H0

z = 8.43; critical values = 1.645; do not reject H0

z = 8.43; critical values = 1.645; reject H0

z = 8.43; critical values = 1.96; reject H0

Question 10

Find the confidence interval specified.

30 students were randomly selected from a large group of students taking a certain calculus test. The mean score for the students in the sample was 86. Assume thatConstruct a 99% confidence interval for the mean score, , of all students taking the test.

Group of answer choices

80.80 to 91.20

82.56 to 89.44

80.78 to 91.22

81.01 to 90.99

Question 11

Find the confidence interval specified.

A random sample of 105 full-grown lobsters had a mean weight ofAssume thatConstruct a 95% confidence interval for the population mean .

Group of answer choices

14.3 to 15.7 ounces

14.0 to 16.0 ounces

14.1 to 15.9 ounces

14.4 to 15.6 ounces

Question 12

Find the indicated probability or percentage for the sampling error.

The monthly expenditures on food by single adults living in one neighborhood of Los Angeles are normally distributed with a mean of $410 and a standard deviation of $105. Determine the percentage of samples of size 9 that will have mean monthly expenditures on food within $28 of the population mean expenditure of $410.

Group of answer choices

57.62%

91.92%

21.28%

98.36%

Question 13

Find the indicated probability or percentage for the normally distributed variable.

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. A vending machine will only accept coins weighing between 5.48 g and 5.82 g. What percentage of legal quarters will be rejected?

Group of answer choices

2.48%

1.62%

1.96%

0.0196%

Question 14

Find the indicated probability or percentage for the normally distributed variable.

A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 50. If an applicant is randomly selected, find the probability of a rating that is between 200 and 275.

Group of answer choices

0.5

0.4332

0.9332

0.0668

Question 15

Find the indicated probability or percentage for the normally distributed variable.

The incomes of trainees at a local mill are normally distributed with a mean of $1,100 and a standard deviation $150. What percentage of trainees earn less than $900 a month?

Group of answer choices

9.18%

90.82%

40.82%

35.31%

Question 16

Find the indicated probability or percentage for the normally distributed variable.

The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter greater than 0.32 inches?

Group of answer choices

37.45%

2.28%

47.72%

97.72%