1.Suppose the 90% confidence interval for the mean SAT scores of applicants at a business collage is given (1,6994,1,824). This confidence interval uses the sample mean and the sample standard deviation based on 25 observations. (you might find it useful reference the t table onhttps://ezto-cf-media.mheducation.com/Media/Connect_Production/bne/Jaggia_ba_1e/t_table.png)

A.What is the sample mean and the sample standard deviation used when computing the interval? (round final answers to 2 decimal places.)

2.An economist reports that 621 out of a sample of 2,300 middle income American households actively participate in the stock market. ( you may find it useful to reference the z table onhttps://ezto-cf-media.mheducation.com/Media/Connect_Production/bne/Jaggia_ba_1e/z_table.png)

A.Construct the 99% confidence interval for the proportion of middle-income American who actively participate in the stock market.(round final answers to 2 decimal places.)

B.Can we conclude that the percentage of middle -income Americans who actively participate in the stock market is not 30%?

a)Yes, since the confidence interval contains the value 0.3

b)Yes, since the confidence interval does not contain the value 0.3

c)No, since the confidence interval contains the value 0.3

d)No, since the confidence interval does not contain the value 0.3