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In the previous problem was it necessary to calculate the confidence interval? Why or why not?

A professor is interested in the study habits of full-time students at a university. The researcher wants to know if students study the recommended minimum of one hour of outside class study time for each hour spent in class. To test his prediction the researcher surveys 10 students and asks the students how many hours they typically study in a week. All of the students are enrolled in 5, 3-unit courses, so the students should study at least 15 hours per week outside of class. Use this information to answer the questions below.

Use the scores below to calculate the observed t-test score to test the prediction that the students study the recommended minimum of 15 hours a week. 5 9 29 7 21 8 30 10 21 29 **Report your final answer to 4 decimal places. **To receive credit for this problem you need to submit a picture of your hand calculations. The picture should show the formulas you used and your hand calculations, including the intermediate steps.

**To receive credit for the t-test problem: Sign and date your scratch paper with your hand calculations. Then take a picture of your hand calculations (make sure you include the formulas used and all work). Make sure the images are clear enough for me to see your work. If I can’t see your work, no credit will be given for the hand calculations. If you have more than one image, paste the pictures into either a single Word document (.doc or .docx) or pdf and then upload the file here.

For each statement below, indicate whether the statement describes a population distribution, sampling distribution of the mean, both distributions, or neither distribution. -It is a distribution of raw scores (X): [pop] -The mean of the distribution equals mu (

A car manufacturer claims that their new car batteries will last 7 years. A group of concerned citizens argues that the batteries do not last as long as the manufacturer claims. To investigate the citizens’ claim, the car manufacturer surveys 20 random car owners and found the average battery lasted 6.89 years with a standard deviation of .25. Fill-in: If the car manufacturer wants to show the batteries do last 7 years they should run a [direction] one-sample [test] test.

If the researcher wants to test the prediction that the students study the recommended minimum of 15 hours a week, what are the appropriate null and alternative hypotheses for the problem?

Which of the following statements are true about directional tests? (Select all that apply.)

The plateau phase of an action potential in cardiac muscle cells is due to the .

The pulse pressure is .