QUESTION 1

The mean rent of a 3-bedroom apartment in Orlando is $1250. You randomly select 13 apartments around town. The rents are normally distributed with a standard deviation of $290. What is the probability that the mean rent is more than $1200?

a. 0.2676

b. 0.7324

c. 0.2709

d. 0.7291

QUESTION 2

Find the critical value of t for a sample size of 23 and a 99% confidence level. Choose the correct value from below:

a. 2.891

b. 2.189

c. 2.918

d. 2.819

QUESTION 3

Assume that adults have IQ scores that are normally distributed, with a mean of 107 and a standard deviation of 15. Find the probability that a randomly selected individual has an IQ between 75 and 117. Choose the correct value:

a. 0.7318

b. 0.7155

c. 0.7320

d. 0.7167

QUESTION 4

Men's heights are normally distributed with a mean of 72.1 inches and a standard deviation of 3.6 inches. A social organization for short people has a requirement that men must be at most 64 inches tall. What percentage of men meet this requirement? Choose the correct answer:

a. 1.19%

b. 1.22%

c. 1.25%

d. 1.18%

QUESTION 5

Your firm wants to investigate how much money the typical tourist will spend on their next visit to New York. How many tourists should be included in your sample if you want to be 99% confident that the sample mean is within $20 from the population mean? From previous studies, we know that the standard deviation is $59.

Choose one.

a. 56

b. 57

c. 58

d. 59

QUESTION 6

Please use the NDT table to answer the following question:

Readings on a thermometer are normally distributed with a mean of 0C and a standard deviation of 1.00.

What is the probability that a randomly selected thermometer reads:

a. Less than -0.67.

b. Greater than -1.34

c. Between -1.56 and 2.07

d. Greater than 0.98

e. Less than -2.65 or greater than 2.65

Choose one.

The probabilities are:

a. 0.2514

b. 0.0901

c. 0.9808

d. 0.1635

e. 0.0040

The probabilities are:

a. 0.2514

b. 0.9099

c. 0.9214

d. 0.1635

e. 0.0080

The probabilities are:

a. 0.2514

b. 0.0901

c. 0.9808

d. 0.1635

e. 0.0080

The probabilities are:

a. 0.2514

b. 0.9099

c. 0.9214

d. 0.1635

e. 0.0040

QUESTION 7

A music industry researcher wants to estimate, with a 95% confidence level, the proportion of young urban people (ages 21 to 35 years) who go to at least 3 concerts a year. Previous studies show that 42% of those people (21 to 35 year olds) interviewed go to at least 3 concerts a year. The researcher wants to be accurate within 1% of the true proportion. Find the minimum sample size necessary.

Choose one.

a. 9604

b. 9385

c. 9358

d. 9220

QUESTION 8

A study of women's weights found that a randomly selected sample of 234 women had a mean weight of 157.3 lb. Assuming that the population standard deviation is 15.6 lb., construct a 95% confidence interval estimate of the mean weight of all women. Choose the correct interval from below: Choose one

a. (145.3, 160.5)

b. (155.3, 159,3)

c. (165.5, 173.5)

d. (185.7, 199.3)

QUESTION 9

Construct a confidence interval for the population mean using a t-distribution:

c = 95% m = 18 s = 5 n = 25. Choose from the intervals listed below.

Choose one

a. (15.940, 20.060)

b. (15.963, 20.604)

c. (15.904, 20.006)

d. (15.936, 20.064)

QUESTION 10

In a survey, 598 out of 1,399 US adults said they drink at least 4 cups of coffee a day. Find a point estimate (P) for the population proportion of US adults who drink at least 4 cups of coffee a day, then construct a 95% confidence interval for the proportion of adults who drink at least 4 cups of coffee a day. Choose one

a. P= 0.4247; (40.51%, 43.36%)

b. P= 0.4274; (40.15%, 45.34%)

c. P= 0.4274; (40.57%, 44.92%)

d. P= 0.4247; (39.34%, 46.15%)