Paint manufacture: Two methods are being considered to increase production of a paint manufacturing process. In a random sample of 63 days, the mean daily production using the first method was 645 tons with a standard deviation of 48 tons. In a random sample of 64 days, the mean daily production using the second method was 630 tons with a standard deviation of 41 tons. Part: 0 / 2 Part 1 of 2 (a) Construct a 99.8% confidence interval for the difference in mean daily production between the two methods. Let u, denote the mean daily production using the first method. Use the table to find the critical value and round the answers to the nearest whole number. A 99.8% confidence interval for the difference in mean daily production between the two methods, in tons, is

Bone mineral density (BMD) is a measure of bone strength. Studies show that BMD declines after age 45. The impact of exercise may increase BMD. A random sample of 59 women between the ages of 41 and 45 with no major health problems were studied. The women were classified into one of two groups based upon their level of exercise activity: walking women and sedentary women. The 39 women who walked regularly had a mean BMD of 5.96 with a standard deviation of 1.22. The 20 women who are sedentary had a mean BMD of 4.41 with a standard deviation of 1.02. Which of the following inference procedures could be used to estimate the difference in the mean BMD for these two types of women

The average undergraduate cost for tuition, fees, and room and board for two-year institutions last year was $14,124. The following year, a random sample of 20 two-year institutions had a mean of $17,124 and a standard deviation of $3700. Is there sufficient evidence at the alpha level of 0.05 to conclude that the mean cost has increased.  Show 6 steps of hypothesis