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Raul received a score of 77 on a history test for which the class mean was 70 with standard deviation of 10. He received a score of 70 on a biology test for which the class mean was 70 with standard deviation of 4. On which test did he do better relative to the rest of the class?
Which is the probability of that the median of the sample or average medians be between 320 and 350 minutes?
Two chi-square distributions were plotted on the same chart. One distribution was for 3 degrees of freedom and the other was for 12 degrees of freedom. Which distribution would tend to approach a normal distribution?
Graph the distribution using a histogram. Calculate the mean and standard deviation.
How many more days should be included in the sample to be 95% sure the population mean μ is within $50 of the sample mean x?
Select an activity you do on a regular basis (e.g., cooking a meal, cleaning the house, doing homework, etc.) and discuss how you could apply statistical quality control to improve the quality of the output of the activity you choose.
An estimated regression coefficient is 10 with a standard error of 5. The null hypothesis is that the partial regression coefficient equals one.
In a public opinion poll, 48% of 189 respondents favor an elimination of taxes on dividend income.
What proportion of the hearing loss in all the workers was attributable to not wearing earplugs?
Determine the regression equation, letting the first variable be the independent (x) variable. Find the indicated predicted values.
The mean area of several thousand apartments in a new development is advertised to be 1250 sq. ft. An engineer measured a random sample of apartments: 1244 1245 1242 1245 1237 1245 1246 1232
Assume that the population of hours worked per week by college graduates employed full-time is normally distributed with mean . Can we conclude that is greater than 40 hours? Use the .01 level of significance.
Would it be reasonable to conclude that the 5 percent of the employees are not able to pass the random drug test?
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