Question
Chapter 14 & 14 Practice Quiz 1) For a sample of n = 18, the correlation between amount of ice cream sold and temperature was
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?
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