In exercise 2100a you computed the interval mean plusmn 2s

Assignment Help Basic Statistics

Reference no: EM13615403

Laptop use in middle school. Refer to the American Secondary Education (Fall 2009) study of middle school students' usage of laptop computers, Exercise 2.100 (p.72). Recall that for a sample of 106 students, the researchers report the following statistics on how many minutes per day each student used laptop for taking notes: mean=13.2, s=19.5. Now the researchers wan to estimate the average amount of time per day laptops are used for taking notes for all middle school students across the country.

A. Define the target parameter for the researchers in words and symbols.

B. In exercise 2.100a, you computed the interval, mean ± 2s. Explain why this formula should not be used as an interval estimate for the target parameter.

C. Calculate a 90% confidence interval for the target parameter. Interpret the result.

D. Explain what the phrase "90% confidence" implies in your answer to c.

E. In exercise 2.100b you concluded that the distribution of laptop usage for taking notes for the sample of 106 students cannot be symmetric. Consequently, the distribution cannot be normal. Does this compromise the validity of the interval estimate, part c? Explain.

Reference no: EM13615403

Questions Cloud

Use the one-proportion z-interval procedure to find the : use the one-proportion z-interval procedure to find the required confidence interval. be sure to check the conditions

Please provide statistical hypotheses a table of expected : the egyptian air force brass believe that overweight pilots have slow reaction times. they attribute the poor

We have given the number of successes and the sample size : we have given the number of successes and the sample size for a simple random sample from a population. in each case do

In exercise 2100a you computed the interval mean plusmn 2s : laptop use in middle school. refer to the american secondary education fall 2009 study of middle school students usage

How will the estimated coecient for iron change after the : 1. the rmse also known as sigma is 10.0 and r 2 0 . 32 . the number of cases was over 12000. the autism i score

The company explains that although this proportion is lower : the company explains that although this proportion is lower than it might wish its not a surprising value given that

A certain colege has 490 of the 584 freshman return as : a certain colege has 490 of the 584 freshman return as sophomores. does this college have a right to brag that it has

Find the z-score for the number that is less than only 1 of : find the z-score for the number that is less than only 1 of the values of a normal

User Account

All Pages