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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?
For a particular company, data was collected on hourly workers and salaried workers preference for two difference pension plans: Plan 1 (p1) and Plan 2 (p2). Using the table below, what is the probability employees prefer Plan 1?
1. at the bottom left side of the applet set n equal to 10 and then check the animate box. now click on flip. record
Develop a 95% confidence interval estimate of the population mean sales price and population mean number of days to sell for Gulf View condominiums. Interpret your results.
Statistical inference for the population proportion To find the effect of a recent policy change on employee morale, a large corporation decides to conduct an opinion survey, asking N randomly selected employees whether they are satisfied with the n..
Sample sizes and standard deviations from the PROC TTEST printout and calculate the pooled estimate of variance
Design that examines the effects of region of residence in northeast, south, mid-west, and west and income that is low, medium, and high
question 1you are a data analyst working for the australian petrol pricing commissioner and have been requested to
Three cases when you should use non-parametric analysis in place of parametric?
What are the key terms in a one sample verbal hypothesis that signify whether you are conducting a one-tailed or two-tailed test? Provide one example each for the use of one-tailed and two-tailed test and also state the Null and the Alternative hypot..
In a survey of 900 college students , 405 out of 900 students has credit card or 45% of the student owned a credit card.
Respond to your peers or the professor and tell the person whether his answer is correct or incorrect and explain why. Indicate the name of the topic and the name of the slice on the Subject line so it is easier for others to follow. Pleas..
What are the variance and standard deviation?
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