People were polled on how many books they read the previous year. Initial survey results indicate that s=15.9 books. Complete parts (a) through (d) below. A. Doubling the required accuracy nearly quarters the sample size. B. Doubling the required accuracy nearly quadruples the sample size. D. Doubling the required accuracy nearly halves the sample size. (d) How manting the required accuracy nearly doubles the sample size. confidence? This \( 99 \% \) confitical values.

5 The distribution of resting pulse rates of a sample of 2000 20-year-old men is approximately normal, with a mean of 66 beats/minute and a standard deviation of 4 beats/minute. a What percentage of these men have pulse rates of: i higher than 66 ? ii between 66 and 70 ? iii between 62 and 74 ? b Approximately how many of this sample of 2000 men have pulse rates between 54 and 78 beats/minute?

The following data are the estimated market values (in millions of dollars) of 12 companies in the auto part business: \( 22,20,15,16,38,11,13,10,19,26,17,30 \) Round your answers in part (a) to 1 decimal place. (a) Calculate the values of \( Q_{1}, Q_{2}, Q_{3} \) \( Q_{1}=\square \) \( Q_{2}= \) \( Q_{3}= \)

A population of values has a normal distribution with \( \mu=111.2 \) and \( \sigma=39 \). You intend to draw a random sample of size \( n=231 \). Please show your answers as numbers accurate to 4 decimal places. Find the probability that a single randomly selected value is between 109.1 and 116.8 . \( P(109.1<X<116.8)=\square \)

During your research on a topic, you run across a blog site where several people posted that fuel prices have gone up \( 10 \% \) in the last six months. You can provide this data in your presentation as which of the following? People across the country are reporting that gas prices have gone up \( 10 \% \) in the last six months. Gas prices have gone up \( 10 \% \) in the last six months. Typical of opinions across the country, users on blahblah-blog.com have mentioned that gas prices have gone up \( 10 \% \) in the last six months.

Find the standard deviation of \( x \), given that \( \Sigma 4 x^{2}=14600, \Sigma 2 x=420 \) and \( n=20 \).