1. 40% of consumers believe that cash will be obsolete in the next 20 years. Assume that 8 consumers are randomly selected. Find the probability that fewer than 3 of the selected consumers believe that cash will be obsolete in the next 20 years.

-What is the probability?

2.In a test of a sex-selection technique, results consisted of 272 female babies and 11

male babies. Based on this result, what is the probability of a female being born to a couple using this technique? Does it appear that the technique is effective in increasing the likelihood that a baby will be a female?

-The probability that a female will be born using this technique is approximately (insert integer or decimal rounded to three decimal places as needed.)

-Does the technique appear effective in improving the likelihood of having a female baby?

3.Find the sample size needed to estimate the mean age of movie patrons such that it can be said with 95%

confidence that the sample mean is within 2 years of the population mean. Assume that =19.7

years, based on a previous report. Could the sample be obtained from one movie at one theater?

-The required sample size is

Could the sample be obtained from one movie at one theater?

A.

The sample should not be obtained from one movie at one theater, because that sample could be easily biased. Instead, a stratified sample of the broader population should be obtained.

B.

The sample should not be obtained from one movie at one theater, because that sample could be easily biased. Instead, a cluster sample of the broader population should be obtained.

C.

The sample should be obtained from one movie at one theater, because that sample is representative of the population.

D.

The sample should not be obtained from one movie at one theater, because that sample could be easily biased. Instead, a simple random sample of the broader population should be obtained.