1. A company wants to estimate the average monthly

income of its customers. It randomly selects 100 customers

and asks them to report their income. The sample mean is

$3,500 and the sample standard deviation is $500. What is

the 95% confidence interval for the population mean

income?

a) ($3,401, $3,599)

b) ($3,392, $3,608)

c) ($3,383, $3,617)

d) ($3,374, $3,626)

Answer: c) ($3,383, $3,617)

Rationale: The 95% confidence interval for the population

mean is given by the formula: sample mean ± 1.96 *

(sample standard deviation / square root of sample size).

Plugging in the given values, we get: 3500 ± 1.96 * (500 /

sqrt(100)) = 3500 ± 98. Thus, the confidence interval is

($3,402, $3,598), which is closest to option c.

2. A researcher wants to test whether there is a significant

difference in the average scores of male and female

students on a math test. The researcher randomly assigns

50 male and 50 female students to take the test. The mean

score for males is 75 and the mean score for females is 80.

The pooled standard deviation is 10. What is the value of

the test statistic for a two-sample t-test?

a) -2.5

b) -2.78

No comments found.
Login to post a comment
This item has not received any review yet.
Login to review this item
No Questions / Answers added yet.
Price $26.00
Add To Cart

Buy Now
Category Exams and Certifications
Comments 0
Rating
Sales 0

Buy Our Plan

We have

The latest updated Study Material Bundle with 100% Satisfaction guarantee

Visit Now
{{ userMessage }}
Processing