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Your statistics teacher has repeatedly told class that more you study, the better you will do on tests. You make decision to verify this statement. You arbitarily choose 12 classmates and ask them how long they studied for last test and what grade they made. Here are the data:
Student Hours studied Grade1 17 912 12 733 8 704 14 865 10 716 3 627 20 878 11 769 7 6810 16 8411 9 6612 15 83
1. Use Hypothesis testing to compute te correlation between these two variables and these it for significance. Test at .01 level of significance.
a. Step 1: State Hypothesisb. Step 2: Set Criteriac. Step 3: Calculate Sample Statistici. Use excel to compute r valued. Step 4: Make a decisioni. Did you reject null/fail to reject nullii. Define your conclusions in your own words
2. Another classmate told you that she studied 25 hours. What would you forecast her score on test?a. Write the regression equation?b. Use regression equation to answer question
Construct a 99% confidence interval on the population mean height of all 1-year-old pine seedlings. What are the confidence limits? What statement can be made about the population mean height using the confidence interval?
Among its various routes, a transit agency operates a trolley line. The line has a total of 18 trolley cars. Some of these cars are unavailable because they are being maintained or repaired.
You wish to evaluate the proportion of customers who are satisfied with their supermarket at level of confidence of .92 and in .025 of true value. How large of sample is required?
Test whether race and NATFAE are independent (α = 0.05). What do you conclude?
What is the expected value of M and the standard error of M for a sample of n=4 scores? What is the expected value of M and the standard error of M for a sample of n = 25 scores?
Determine the typical seasonal patterns for sales using the ratio-to-moving-average method. Project the sales for 2004, and then seasonally adjust each quarter.
Which of the following studies used a participant observer approach?
Develop a linear regression model for these data and forecast carpet sales if 30 construction permits for new homes are filed.
To find out the test statistics utilizing chi square method. A professional bowler has been having trouble 'hitting the pocket' in order to get strikes.
In rectangular coordinate system, determine the distance between the points (-4,1) and (8,6).
WHich sampling method from the choices listed above would be best? Describe how you would carry out your chosen sampling method of a student from part (a)
In an online survey of 4,001 respondents, 8% were classified as productivity enhancers who are comfortable with technology and use the Internet for its practical value (data extracted from M. Himowitz, "How to Tell What Kind of Tech User You Are,"..
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