Question

Each person in a random sample of 226 male teenagers and a random sample of 301...

Each person in a random sample of 226 male teenagers and a random sample of 301 female teenagers was asked how many hours he or she spent online in a typical week. The sample mean and standard deviation were 15.3 hours and 11.3 hours for males and 14.1 and 11.8 for females. (Use a statistical computer package to calculate the P-value. Use μmalesμfemales. Round your test statistic to two decimal places, your df down to the nearest whole number, and your P-value to three decimal places.)

t =
df =
P =

Homework Answers

Answer #1

Two-Sample T-Test and CI

Method

μ₁: mean of Males
µ₂: mean of Females
Difference: μ₁ - µ₂

Equal variances are not assumed for this analysis.

Descriptive Statistics

Sample N Mean StDev SE Mean
Sample 1 226 15.3 11.3 0.75
Sample 2 301 14.1 11.8 0.68

Estimation for Difference

Difference 95% CI for
Difference
1.20 (-0.79, 3.19)

Test

Null hypothesis H₀: μ₁ - µ₂ = 0
Alternative hypothesis H₁: μ₁ - µ₂ ≠ 0
T-Value DF P-Value
1.18 495 0.237
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