Click the icon to view a partial table of critical values. (a) How many subjects are needed to estimate the mean number of books read the previous year within six books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject) (b) How many subjects are needed to estimate the mean number of books read the previous year within three books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) (c) What effect does doubling the required accuracy have on the sample size? O A. Doubling the required accuracy nearly quarters the sample size. O B. Doubling the required accuracy nearly doubles the sample size. OC. Doubling the required accuracy nearly quadruples the sample size. OD. Doubling the required accuracy nearly halves the sample size. (d) How many subjects are needed to estimate the mean number of books read the previous year within six books with 99% confidence? This 99% confidence level requires subjects. (Round up to the nearest subject.) Compare this result to part (a) How does increasing the level of confidence in the estimate affect sample size? Why is this reasonable?

A2 Consider the following summary statistics: (i) The sample mean. (ii) The sample standard deviation. (iii) The first quartile. (iv) The sample variance. (v) The interquartile range. Which of these statistics are measures for the spread of a sample? A: (i), (ii), and (v) B: (i) and (ii) C: (ii), (iv), and (v) E: (iii) and (v) Circle the correct letter: A B с D E D: (iii) and (iv)

What percent of 2 rad is ?/11 rad?

The weight of a package mailed during the holidays follows a uniform distribution and ranges from 2 pounds to 9 pounds.  85% of the time, the package will be greater than what value?   Round to 2 decimals.