Chapter 14 & 14 Practice Quiz

1) For a sample of n = 18, the correlation between amount of ice cream sold and temperature was calculated to be0.61.What are the appropriate null and alternative hypotheses to test forcorrelation?

2) For a sample of n = 18, the correlation between amount of ice cream sold and temperature was calculated to be0.61.Use=0.10. Calculate thet-test statistic for correlation.

3) For a sample of n = 18, the correlation between amount of ice cream sold and temperature was calculated to be0.61.Based on the sampleresults, we are testing to determine whether there is a significantcorrelationbetween these two variables.

Determine the criticalvalue for the rejection region for the test statistic t, using=0.10.

4) For a sample of n = 18, the correlation between amount of ice cream sold and temperature was calculated to be0.61.Based on the sampleresults, we are testing to determine whether there is a significantcorrelationbetween these two variables.Use=0.10.

Would you reject the null hypothesis that there is correlation between the 2 variables?

5)We have collected costs for private and state universities. Data is in dollars and was collected for 6 different regions. Use linear regression analysis where the cost for a private university is predicted by the cost of a state university. Calculate the beta and significance for private using=0.05.

6) We have collected costs for private and state universities. Data is in dollars and was collected for 6 different regions. Use linear regression analysis where the cost for a private university is predicted by the cost of a state university. Calculate the beta and significance for private using=0.05. Using your model, when the public cost is $8,000,what is the expected cost for a private university?

7) The scatter plot is a two dimensional graph that is used to graphically represent the relationship between two variables.

8) The correlation coefficient provides information about the curved nature between 2 variables.

9) If the correlation between two variables is found to be0.70,which of the following is true?

10) If the calculated sample correlation between two variables isr=0.372 and n = 36,what is the test statistic value for testing whether the true population correlation coefficient is equal tozero?

11) If a sample correlation coefficientis r=.38 and the sample size is 15,which of the following is appropriate critical value for testing the null hypothesis of= 0 at analpha=.05level?