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How many commuters must be randompy selected to estimate the mean of driving time of chicago commuters? We want 98% confidence that the sample mean is within 2 minutes of the population mean, and the poplation standard deviation is known to be 10 minutes.
Calculate the t test statistic. Can you reject ρ = 0? (e) Use Excel's function =TDIST(t,deg_freedom,tails) to calculate the two-tail p-value.
Suppose the organizers of the study are reconsidering their sample-size estimate. How many participants should be enrolled in each of the active and control intervention groups to achieve 80% power if a two-sided test is used with α = .05
Paul received a score of 80 on a history test for which the class mean was 70 with a standard deviation of 10. He received a score of 75 on a biology test for which the class mean was 70
a survey reported that 70 of those responding to a national survey of college freshmen were interested in taking summer
Scores on a test are normally distributed with a mean of 60.9 and a standard deviation of 12. Find P81, which separates the bottom 81% from the top 19%.
a nonprofit company concerned with the school dropout rate in a nearby state has designed a tutoring program aimed at
a researcher believe that college students spend a different amount of time talking on the phone than they do instant
Create raw score predictions on criterion variable for persons with Z scores on predictor value of -2,-1,0,+1,+2.
Write the example of statistics in news to explain the following statement which represents one of the objectives of statistics analysis: "Statistics assists us make decisions.
What is an independent sample? What is a related sample? When should researchers use different hypothesis tests for independent and related samples?
A random sample of 100 students at Southern University was collected. The mean age was found to be 24.2 years, with a standard deviation of 3.4 years.
suppose 15 of the trees in a forest have severe leaf damage from air pollution. if 5 trees are selected at random find
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