Blog

The scores from a state standardized test have a bell-shaped distribution with a mean of 100 and a standard deviation of 15. Use the Empirical Rule to find the percentage of students with scoresbetween 70 and 130.

Calculate the mean, median, and mode for the following sample: 5, 10, 6, 11, 3, 3, 10, 3 Just write down your answers. That is, Mean=? Median=? Mode=?

Find the standardized test statistic estimate, , to test the hypothesis that . Use α = 0.01. The sample statistics listed below are from independent samples.Sample statistics: , and

Find the probability that in 200 tosses of a fair six-sided die, a three will be obtained at most 40 times.

Is there a relationship between the raises administrators at State University receive and their performance on the job? A faculty group wants to determine whether job rating (x) is a useful linear predictor of raise (y). Consequently, the group considered the straight-line regression model, 

 For a random sample of 30 countries, the linear correlation coefficient between the infant mortality rate and the average number of cars per capita was found to be r = -0.717. What does this imply? Does this suggest that if people buy more cars, this could lower the infant mortality rate. Why or why not? What is a likely lurking variable?

Once you submit your test to HonorLock, you will have FIVE minutes to scan and upload this answer to Canvas Assignments.

Two samples are randomly selected from normalpopulations.  Calculate the test statistic to test the hypothesis that

Once you submit your test to HonorLock, you will have FIVE minutes to scan and upload this answer to Canvas Assignments.    

Construct a 99% confidence interval for the population mean, μ. Assume the population has a normal distribution. A group of 19 randomly selected employees has a mean age of 22.4 years with a standard deviation of 3.8 years. Round to the nearest tenth.