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We would like to estimate the true mean amount of time (in minutes) Canadian teenagers spend on the internet per day. The population standard deviation of daily internet usage time is known to be 55 minutes.(a) What sample size is required in order to estimate to within 15 minutes with 90% confidence? (b) What sample size is required in order to estimate to within 5 minutes with 90% confidence? (c) For a fixed confidence level, when we decrease the desired margin of error to one third its original value, how many times larger a sample size will be require?(d) What sample size is required in order to estimate to within 15 minutes with 98% confidence? (e) For a fixed margin of error, when we increase the desired confidence level, what happens to the required sample size? (increase, decrease or remain the same).(f) The United States has ten times the population of Canada. Assuming equal standard deviations, how many American teenagers must be sampled in order to estimate the true mean amount of time American teenagers spend on the internet per day to within 15 minutes with 90% confidence?
Draw the activity network for this problem and determine the Expected Times and determine the activity schedule (ES, EF, LS, and LF) as well as slack.
Calculate the standard deviation for the sample mean
Analyze the data using SPSS. If it is necessary to perform simple main effects, do so. Calculate and report effect sizes and create a table reporting the results of the ANOVA
The average time scheduled for a doctor's visit is 25 minutes with a standard deviation of 22 minutes. A researcher uses a sampling distribution made up of samples of size 271. According to the Central Limit Theore, what is the mean of sampling dis..
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Kris Lee, the owner and manager of the Quality Hardware Store, is reassessing his inventory policy for hammers. He sells an average of 50 hammers per month, so he has been placing an order to purchase 50 hammers from a wholesaler at a cost of $20 per..
A. In a recent sample of 84 used car sales costs, the sample mean was $6,425 with a standard deviation of $3,156. Assume the underlying distribution is approximately normal. a. Which distribution should you use for this problem? Explain your choice...
the initial research proposal will consist of the following six items1. identify a business research topic2. define the
All students in a class are divided into groups of 15. One student is randomly chosen from the first group, the remaining observations are every 15th student thereafter.
writenbspa 2 page critique of an online user manual. you can download a usernbspmanualuser guide for a product of your
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