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Distribution of samle means

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Please, help m with these. Thank you very much.

1. A sample of size 20 is selected from a normally distributed population. The sample standard deviation is 4.150. What is the standard rror of the distribution of samle means? Enter response with 3 decimal places.

2. To compute a confidence interval for the mean, population standard deviation unknown, n=35, and a=0.01, enter the critical value with 3 decimal places.

3. To compute a confidence interval for the mean, population standard deviation unknown, n=25, and a=0.010, enter the critical value with 3 decimal places.

4. A sample of 10 widgets has a mean of 39.200 and standard deviation of 9.950. At 90% confidence,the lower limit with 3 decimal places is.

5. A sample of 18 widgets has a mean of 31.650 and standard deviation of 10.000. At 99% confidence, the upper limit with 3 decimal places is.

6. A statistics course has 22 students in which 80.0% passed. At 90% confidence, the lower confidence limit for the proportion students passing with 3 decimal places is.

7. A statistics course has 22 students in which 70% passed. At 95% confidence, the upper confidence limit for the proportion students passing with 3 decimal places is.

Reference no: EM132263594

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