Statistics and Correlation

A fast food chain owner claims that the average number of people who visits their store is 1350 daily with a standard deviation of 30. A random sample of 20 days showed that the average number of people who visits their store is 1400. What is the appropriate form of test statistic?

• q - test

• z - test

• t - test

• x - test

• P5,500.00

• P7,000.00

• P6,000.00

• P6,700.00

Which of the following scatter plots show a moderately negative correlation?

• 
• 
• 
• 

Which of the following values of r shows the strongest correlation?

• -0.12

• 0.26

• -0.57

• 0.50

The correlation of the following pairs of variables can be calculated using the Pearson’s sample correlation coefficient except for one. Which of the following is not included?

• height and arm span

• age and weight

• age and gender

• IQ level and grade-point average

Which of the following best the describes trend (direction), and variation (strength) based on the scatter plot of the given data. Explain your answer in your answer sheet.

• weak negative correlation

• strong negative correlation

• weak positive correlation

• strong positive correlation

Calculates the Pearson’s sample correlation coefficient of the given data. Show your solution in your answer sheet.

• -0.944

• -0.499

• 0.499

• 0.944

Which of the following best describes trend (direction), and variation (strength) based on Correlation Coefficient of the given data. Explain your answer in your answer sheet.

• weak negative correlation

• moderate negative correlation

• strong negative correlation

• perfect negative correlation

Based on the description of Correlation Coefficient of the given data. What is the appropriate interpretation? Complete the statement in your answer sheet.

• It slightly suggests that the more ___ a student has, the lower is his or her ___.

• It slightly suggests that the more ___ a student has, the higher is his or her ___.

• It strongly suggests that the more ___ a student has, the lower is his or her ___.

• It strongly suggests that the more ___ a student has, the higher is his or her ___.

To test the claim that there is significant correlation between the number of absences and the final grades of seven randomly selected students from a statistics class, determine the appropriate critical value at 0.05 significance level? Illustrate in your answer sheet.