1-2. The sample of n = 30 people is selected and the sample correlation between two...
1-2. The sample of n = 30 people is selected and the sample correlation between two variables is r = 0.468.
1. What is the test statistic value for testing whether the true population correlation coefficient is equal to zero? (calculate t-test statistic)
2. What is the t- critical value for alpha= 0.01. and what you can conclude about population correlation ( is there significant correlation between two variables).
Homework Answers
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1-2. The sample of n = 30
people is selected and the sample correlation between two...
(a) Suppose n = 6 and the sample correlation coefficient is r=0.894. IS significant at the...
(a) Suppose n = 6 and the sample correlation coefficient is r=0.894. IS significant at the 1% level of significance (based on a two-tailed test)? (Round your answers to three decimal places.) critical Conclusion: Yes, the correlation coefficient p is significantly different from 0 at the 0.01 level of significance. No, the correlation coefficient p is not significantly different from 0 at the 0.01 level of significance. (b) Suppose n = 10 and the sample correlation coefficient is r =...
Consider the following competing hypotheses: H0: ρxy ≥ 0 HA: ρxy < 0 The sample consists of 30 observations and the sample correlation coefficient is –0.46. [You may find it useful to reference t...
Consider the following competing hypotheses:
H0: ρxy ≥ 0
HA: ρxy < 0
The sample consists of 30 observations and the sample correlation
coefficient is –0.46. [You may find it useful to reference
the t table.]
a-1. Calculate the value of the test statistic.
(Round intermediate calculations to at least 4 decimal
places and final answer to 3 decimal places.)
a-2. Find the p-value.
p-value < 0.01
p-value
0.10
0.05
p-value < 0.10
0.025
p-value < 0.05
0.01
p-value <...
Test the claim that the correlation between two variables is zero when a sample of 27...
Test the claim that the correlation between two variables is zero when a sample of 27 points has the correlation coefficient of 0.35. Test with alpha = 0.1.
(a) Supposen - 6 and the sample correlation coefficient is r=0.884. Is significant at the 1%...
(a) Supposen - 6 and the sample correlation coefficient is r=0.884. Is significant at the 1% level of significance (based on a two-tailed test)? (Round your answers to three decimal places) critical Condusion: Yes, the correlation coefficient p is significantly different from 0 at the 0.01 level of significance No, the correlation coefficient is not significantly different from 0 at the 0.01 level of significance (b) Supposen - 10 and the sample correlation coefficient is 0.884. Isr significant at the...
7. You are testing the null hypothesis that there is no linear relationship between two variables,...
7. You are testing the null hypothesis that there is no linear relationship between two variables, X and Y. From your sample of n=18, you determine that b1=4.4 and Sb1=1.7. a. What is the value of tSTAT? b. At the α=0.05 level of significance, what are the critical values? c. Based on your answers to (a) and (b), what statistical decision should you make? d. Construct a 95% confidence interval estimate of the population slope, β1. 8. You are testing...
A correlation tests whether differences exist between two variables. Question 1 options: a) True b) False...
A correlation tests whether differences exist between two variables. Question 1 options: a) True b) False Question 2 (1 point) You have tested to find whether a relationship exists between hours of sleep the night before an exam and grade on the exam. You have a participant pool of n = 30, df = 28. Your hypothesis is that a significant relationship will exist, where those with more hours of sleep receive higher grades on the exam. This is a...
Sarah is the office manager for a group of financial advisors who provide financial services for...
Sarah is the office manager for a group of financial advisors who provide financial services for individual clients. She would like to investigate whether a relationship exists between the number of presentations made to prospective clients in a month and the number of new clients per month. The accompanying table shows the number of presentations and corresponding new clients for a random sample of six employees. Sarah would like to use simple regression analysis to estimate the number of new...
ou are testing the null hypothesis that there is no relationship between two variables, X and...
ou are testing the null hypothesis that there is no relationship between two variables, X and Y. From your sample of you n=20 determine that SSR= 80 and SSE=20. What is the value of FSTAT? At the a= 0.05level of significance, what is the critical value? Compute the correlation coefficient by first computing r^2 and assuming the b1 is negative. r^2= r= Find the test statistic tSTAT= Determine the critical values of t. The lower critical value is The upper...
Use the sample correlation r=0.42 and the sample size n=25 to see if there is evidence...
Use the sample correlation r=0.42 and the sample size n=25 to see if there is evidence that the population correlation between the two variables is different than zero. (a) What are the null and alternative hypotheses? (b) What is the test statistic? Round your answer to three decimal places (c) What are the degrees of freedom? Enter the exact answer. (d) What is the p-value. Round your answer to three decimal places. (e) What is the conclusion, using a 5%...
Question 13 of 20 1.0 Points Suppose the sample correlation of two variables 2 and y...
Question 13 of 20 1.0 Points Suppose the sample correlation of two variables 2 and y is 0.6 where the sample size is 17. Calculate the test. statistic to test whether the population correlation is zero or not. (Use 4 decimal places for all intermediates and round your final answer to 2 decimal places.)
(a) Suppose n = 6 and the sample correlation coefficient is r=0.894. IS significant at the 1% level of significance (based on a two-tailed test)? (Round your answers to three decimal places.) critical Conclusion: Yes, the correlation coefficient p is significantly different from 0 at the 0.01 level of significance. No, the correlation coefficient p is not significantly different from 0 at the 0.01 level of significance. (b) Suppose n = 10 and the sample correlation coefficient is r =...
Consider the following competing hypotheses:
H0: ρxy ≥ 0
HA: ρxy < 0
The sample consists of 30 observations and the sample correlation
coefficient is –0.46. [You may find it useful to reference
the t table.]
a-1. Calculate the value of the test statistic.
(Round intermediate calculations to at least 4 decimal
places and final answer to 3 decimal places.)
a-2. Find the p-value.
p-value < 0.01
p-value
0.10
0.05
p-value < 0.10
0.025
p-value < 0.05
0.01
p-value <...
(a) Supposen - 6 and the sample correlation coefficient is r=0.884. Is significant at the 1% level of significance (based on a two-tailed test)? (Round your answers to three decimal places) critical Condusion: Yes, the correlation coefficient p is significantly different from 0 at the 0.01 level of significance No, the correlation coefficient is not significantly different from 0 at the 0.01 level of significance (b) Supposen - 10 and the sample correlation coefficient is 0.884. Isr significant at the...
Question 13 of 20 1.0 Points Suppose the sample correlation of two variables 2 and y is 0.6 where the sample size is 17. Calculate the test. statistic to test whether the population correlation is zero or not. (Use 4 decimal places for all intermediates and round your final answer to 2 decimal places.)
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