Stats: Chapter 7 TEST - Adolphson

Suppose a confidence interval is 9.65 < μ < 11.35. find the sample mean.

• 9.65

• 11.35

• 0.85

• 10.5

Suppose a confidence interval is 9.65 < μ < 11.35. Find the margin of error.

• 9.65

• 1.7

• 0.85

• 10.5

Express the confidence interval 0.38 < p < 0.54 in the form p ± E.

• 0.46 ± 0.08

• 0.46 ± 0.16

• 0.38 ± 0.16

• 0.54 ± 0.08

Find the margin of error that corresponds to the given statistics and confidence level. 90% confidence level; n = 300; x = 140.

• 0.4667

• 0.0474

• .4193

• .514

Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p.

n= 195; x = 162; 95% confidence

• (0.7781, 0.8834)

• (0.7781, 0.8308)

• (0.8308, 0.8834)

32 randomly picked people were asked if they rented or owned their home. 8 said they rented. Obtain a point estimate of the proportion of home owners.

• .25

• .75

• .32

• .08

Of 380 randomly selected medical students, 21 said that they planned to work in a rural community. Find a 95% confidence interval for the true population of all medical students who plan to work in a rural community.

• (0.0323, 0.0553)

• (0.0553, 0.0782)

• (0.0323, 0.0782)

Of 346 cell phones, 12 are found to be defective. Construct the 98% confidence interval for the proportion of all such cell phones that are defective.

• (0.012, 0.058)

• (0.012, 0.035)

• (0.035, 0.058)

Use the given data to find the minimum sample size required to estimate the population proportion.

Margin of error = 0.012; Confidence Level = 93%; p̂ & q unknown.

• 5688

• 5687

• 5419

• 5420

Use the given data to find the minimum sample size required to estimate the population proportion.

Margin of error = 0.07; Confidence Level = 95%; p̂ is estimated by 0.92.

• 62

• 63

• 57

• 58