A study aims to compare the social media usage rates of men and women.  Nine men and 9 women are drawn from the general population and the average time (in minutes) they spent on social media each day was compared (men’s mean = 40, sum of squares = 153; women’s mean = 48, sum of squares = 216).  What is the (a) estimated population variance for each random sample, and (b) pooled variance?       Estimated population variances = 19.13 and 27.00; Pooled variance = 23.07       Estimated population variances = 19.13 and 27.00; Pooled variance = 20.50       Estimated population variances = 17.00 and 24.00; Pooled variance = 20.50       Estimated population variances = 17.00 and 24.00; Pooled variance = 23.07

In a certain population, the mean price of the stock prices was 230, the median was 255, the variance was 1225, the first quartile was 240. and the third quartile was 270. Find the second quartile ? What percentage of data values is less than or equal 270? OApproximately 68%. OApproximately 50% OApproximately 75% OApproximately 25% OApproximately 95% OApproximately 100% What is the coefficient of variation? 018.78% 0532.61% 015.22% 0657.14% O14.89% Determine whether the data value 160 is an outlier or not ? OYes. ONo. OCan't conclude.

A pairwise comparison is a comparison of two pieces of fruit. a comparison of two means. a comparison of two variances.

A nationwide job recruiting firm wants to compare the annual incomes for childcare workers in Utah and Oregon. Due to recent trends in the childcare industry, the firm suspects that the mean annual income of childcare workers in Utah is less than the mean annual income of childcare workers in Oregon. To see if this is true, the firm selected a random sample of 20 childcare workers from Utah and an independent random sample of 20 childcare workers from Oregon and asked them to report their mean annual income. The data obtained were as follows. Annual income in dollars 27060 , 42320 , 36445 , 37895, 44564 , 35325 , 30313 , 28698, 33706 , 48365 , 26946 , 25063 , 28339 , 29265 , 40051 , 37026 , 40150 , 42753 , 27820, 39471 Utah 29769 , 48859 , 32480 , 36288,45102 , 46219 ,51098 , 45516 , 38834 , 44659 , 40755 , 38006 , 39947 , 29801 , 32200, 38731 , 41370 , 28059 , 33753 , 35271 Oregon Send data to calc... v Send data to Excel The population standard deviation for the annual incomes of…