Recent recommendations suggest 60 minutes of physical activity per day. A sample of 50 adults in a study of cardiovascular risk factors report exercising a mean of 38 minutes per day with a standrad deviation of 19 minutes. Based on the sample data, is the physical activity significantly less tjam recommended? Run the appropriate test at a 5% level of significance.

The average hours of sleep on a weeknight was 6.9 hours with a standard deviation of 1.5 hours. What is the proportion of men who sleep for less than 6 hours per night ?

Scores on the American College Testing (ACT) college entrance exam follow the normal distribution with mean 18 and standard deviation 6. Wayne's standard score on the ACT was –1.1.

Response time is an important statistic for measuring the effectiveness of a fire department, and is measured as the difference between the time a fire station receives a call and the time the first piece of fire equipment leaves the station. The response times for fire departments in a large city are found to have an approximately Normal distribution, with a mean of 4.5 minutes and a standard deviation of 1.2 minutes. What percentage of fire station response times are under 3 minutes? Find the z-table here. https://r03.core.learn.edgenuity.com/contentviewers/Emissary/OpenEmissaryLink/?a=http%3A%2F%2Fmedia.edgenuity.com%2Fcontentengine%2Fcommon%2F%2Fpassages%2F3112%2F1-3112-common-docs%2F3112-z-table.html&t=111000000000&l=&s=f2b2af05-7f11-ec11-8255-ef70046ba7f2 6.68% 10.56% 89.44% 93.32%