Question
. As part of an investigation of employee turnover, an industry-wide survey of people in
sales management positions gave the number of years of experience in sales relate
positions. The data is as follows:
Males Females
Sample size 80 70
Mean years 21.7 18.5
Std.dev of years 9.3 4.8
Construct a 95% confidence interval for the difference of means µ1 - µ2 .
Answer :
Word Count : 165
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Given data: - **Males:** \(n_1=80,\ \bar X_1=21.7,\ s_1=9.3\) - **Females:** \(n_2=70,\ \bar X_2=18.5,\ s_2=4.8\) - Confidence level = **95%** We need to construct a 95% confidence interval for the difference of means: \[ \mu_1-\mu_2 \] Difference between sample means \[ \bar X_1-\bar X_2=21.7-18.5=3.2
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