Unit 10 Population Proportions Review

Front

A 90% confidence interval for the average salary of all CEOs in the electronics industry was constructed using the results of a random survey of 45 CEOs. The interval was ($139,048, $154,144). Give a practical interpretation of the interval.

Back

We are 90% confident that the mean salary of all CEOs in the electronics industry falls in the interval $139,048 to $154,144.

Front

What is the 95% confidence interval of the true proportion of women in Europe who use the Internet based on a study of 750 Internet users where 35% were women? Options: 0.321 < p < 0.379, 0.316 < p < 0.384, 0.309 < p < 0.391, 0.305 < p < 0.395

Back

0.316 < p < 0.384

Front

What is the 90% confidence interval of the true proportion of teenage boys who have received speeding tickets in a sample of 90 teenage boys where 70% have received speeding tickets? Options: (0.621, 0.780), (0.591, 0.812), (0.584, 0.830), (0.615, 0.805)

Back

(0.621, 0.780)

Front

What is the format for interpreting a confidence interval?

Back

We are C% confident that the interval from ___ to ___ captures the [parameter in context].

Front

What is the critical value z* for a 99% confidence interval?

Back

2.58

Front

What does 50 represent in the context of a sample of 50 students where 28% believe Monday will be a snow day?

Back

n

Front

What is the standard deviation of the distribution? Options: 1010, 20, 60, √20

Back

20

Front

The amount added and subtracted to the statistic.

Back

Margin of Error

Front

Does the information from USA Today indicate an attitude change in elementary school children regarding wanting to help others when they grow up? Options: One-Sample Z Test for a Proportion, Two-Sample Z Test for the Difference in Proportions, One-Sample T Test for a Mean, Two-Sample T Test for the Difference in Means

Back

One-Sample Z Test for a Proportion

Front

The manufacturer of a particular brand of microwave popcorn claims that only 2 percent of its kernels of corn fail to pop. A competitor tests 2,000 kernels and finds that 44 failed to pop. Do these results provide sufficient evidence to support the competitor's belief? Options: One-Sample Z Test for a Proportion, One-Sample T Test for a Mean, Two-Sample Z Test for a Proportion, Matched-Pairs T Test for a Mean

Back

One-Sample Z Test for a Proportion