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A researcher wants to collect data about the study habits of sophomores at Harmond University. From the sophomore class of 2,300 students, she wants to collect a sample of 70 students. Which of the following sampling methods will yield the most representative sample?
A. Assigning each sophomore a number and then randomly generating 70 numbers from that list.
B. Randomly selecting 70 sophomores entering the university's main library on a randomly selected evening.
C. Selecting the 70 sophomores whose grade point averages (GPA) fall closest to the mean GPA of the sophomore class.
D. Randomly selecting 70 sophomores who are members of college fraternities.
The probability of drawing two diamonds (to complete a flush) after discarding the 5 and 7.
Select the level of significance, and determine critical, ZCR value.
Out to right, create a 90% confidence interval estimate of sigma (σ), population standard deviation.
A company makes camshafts. The camshaft lengths need to be within a certain tolerance or they will not fit. They have produced x bar and s charts
Testing for population mean - What happens as you use different levels of significance? Different values of the standard deviation?
A researcher used stepwise regression to create regression models to predict Birth-Rate (births per1000) using five predictors:
The study does not give sufficient evidence to support the claim that less than 75% of college students spend less than $250 per semester on textbooks.
The quality-control inspector of a production plant will reject a batch of syringes if two or more defective syringes are found in a random sample of eight syringes taken from the batch. Assume the batch contains 1% defective syringes.
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p-value.
Do the data from this sample provide evidence for a significant increase in REM activity during exams? Use a one-tailed test with _ = .01. B.) Compute Cohen's d to estimate the size of the effect.
If statistically significant, do you think the difference is large enough to be important?
Support colour-coding on packaged food to indicate healthier options
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