A correlation coefficient can take any value between 0 and 100. 1 and 100. -1.00

Question

A correlation coefficient can take any value between 0 and 100. 1 and 100. -1.00 and 1,00. 1 and 10. any positive or negative value. A correlation coefficient was computed for O = 12, alpha=.01 and r = 0.587. Using Table 1, what are the critical values for this correlation coefficient? For the result above, what conclusion would you make about the null hypothesis, H_o: rho = 0? Interpret your conclusion. Which of the following correlation coefficient would correspond with the set of data that would most likely produce an accurate regression -.09 66 50 25 -.88 In a recent survey of 64 housewives, the average number of hours per week they watched television was 28 with a standard deviation of 4 hours. What is the 90% confidence interval of the mean number of hours watched by all housewives?

Explanation / Answer

9) option C is correct

10)critical value for 0.01 level and (n-2=10) degree of freedom t=3.1693

hence critical value for correlation coefficient = -/+0.708

11)as r is less then critical value of correlation coefficient ;we can not reject null hypothesis

there is no signfiicant correlation.

12)

option e is correct;as aboslute value of correlation coefficient is highest.

13)

here std error of mean =std deviation/(n)1/2 =0.5

for (n-1=63) degree of freedom and 90% CI, t=1.669

therefore 90% confidence interval =sample mean -/+ t*std error =27.1653 ; 28.8347

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