THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

question 98

Multiple Choice

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
From a random sample of ten students in an operations management class that uses group-learning techniques,the mean examination score was found to be 82.75 and the sample standard deviation was 3.24.For an independent random sample of eight students in another marketing research class that does not use group-learning techniques,the sample mean and standard deviation of exam scores were 75.62 and 7.27,respectively.It is assumed that the and unknown population variances are not assumed to be equal.
-Find the 95% confidence for the difference between the two population mean scores.

• A)7.13 ± 13.29
• B)7.13 ± 0.97
• C)7.13 ± 14.26
• D)7.13 ± 6.16

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Definitions:

Correlation

A statistical measure that describes the degree to which two variables move in relation to each other.

Standard Deviation

A statistical measure that represents the dispersion or variability of a data set or investment returns around the mean.

Covariance

A measure of the degree to which two variables move in relation to each other. It can indicate if the movements are positively or negatively correlated.

Portfolio

A collection of financial investments like stocks, bonds, commodities, and cash equivalents owned by an individual or institutional investor.