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Question: In each situation, indicate whether you think an observational study or a randomized experiment would be used. Explain why in each case.
a. A teacher wants to compare the grade point averages of female students who are in sororities to the grade point averages of female students who are not in sororities.
b. A doctor wants to compare the effectiveness of two allergy medications.
c. A social psychologist wants to determine whether restaurant servers will get better tips if they introduce themselves by name to the people they serve.
d. A child psychologist wants to find out whether there is an association between the amount of television 6-year-old children watch and how often they bully other children in school.
What was the aftermath of the "Great War" in Europe and the world at large? What 20th century trends do we see starting during this period that build and grow throughout the century?
A sample of the math test scores of 35 fourth-graders has a mean of 82 with a standard deviation of 15.
Two methods for training accountants are to be compared. Students are randomly assigned to one of the two methods.- Using Welch's test, would you conclude that the methods differ in terms of the average return? Use α = .05.
Here is my data: these are the wages for women with a 2 yr degree, $11,702, $24,509, $34,746, $35,185 (median of $29,627) These are the wages for women with a 4 yr.
A management trainee is selected at random. What is the probability that the person selected is a female who did not attend college?
Calculate the probability that the median of the sample or average medians is:
europeans are increasingly upset at their leaders for making deep budget cuts to many social programs that are becoming
question two automatic dispensing machines are being considered for use in a fast-food chain. the first dispenses an
when calculating a sample size for a hypothesis test with the altenative hypothesis being ha micro1?micro2a use table
The financial aid office of a university asks a sample of students about their employment and earnings. The report says that "for academic year earnings, a significant difference (p = 0.038) was found between the sexes, with men earning more on th..
the average length of a new born baby is 20 inches with a standard deviation of 1 inch.if n100 what is the mean of the
Spinning a coin, unlike tossing it, may not give heads and tails equal probabilities. I spun a penny 200 times and got 83 heads. How significant is this evidence against equal probabilities?
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