Take a random sample 250 Calculate 95% confidence interval for variable Calculat

Question

Take a random sample 250 Calculate 95% confidence interval for variable Calculate 90% confidence interval for variable Cases Valid Missing Total Years math teacher has 180 | 72.0% 701 28.0% 2501 100.0% taught high school math Descriptives Statistic Std. Error Years math teacher has Mean 95% Confidence Interval for Mean 5% Trimmed Mean Median Variance Sid Deviation Minimum Maximum 9.44 639 taught high school math Lower Bound .8.18 Upper Bound1070 8.71 73510 8.574 Interquartile Range Skewness Kurtosis 31 30 10 1.309 721 181 360

Explanation / Answer

The given data indicates the different statistics about the years math teacher has taught high school math.

Mean number of years math teacher has taught high school math is 9.44 years and std. dev. 8.574 years.

This data ranges between minimum value of 1 year to maximum value of 31 years.

Median 7 indicates, 50% of math teachers has taught high school math for less than 7 years.

1. 95% CI = (8.18, 10.70) indicates for any sample of size of 250, we are 95% confident that sample mean will be withing 8.18 and 10.70.

2. 90% CI = (8.38, 10.50) indicates for any sample of size of 250, we are 90% confident that sample mean will be withing 8.38 and 10.50.

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