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Question: Refer to a study described in a Sacramento Bee article titled "Much Ado Over Those Bad Hairdos" (January 26, 2000, p. A21). Here is part of the article:
Researchers surveyed 60 men and 60 women from 17 to 30, most of them Yale students. They were separated into three groups. One group was questioned about times in their lives when they had bad hair. The second group was told to think about bad product packaging, like leaky containers, to get them in a negative mind-set. The third group was not asked to think about anything negative. The groups were tested for self-esteem and self-judgment, and the bad hair group scored lower than the others.
Was this an observational study or a randomized experiment? Explain.
The chance the late flight is full is 0.7. The chance both flights are full is 0.6. Can we believe the two flights being full are independent events?
I could reach my target of 2800 at each of the 5 bookies, making my total profit for the month 14000, or hit my target of -12000 for a total loss of 60000 x 25% kickback, making the total loss for the month only 45000.
A large bakery buys flour in 25-pound bags. The bakery uses an average of 4,860 bags a year. Preparing an order and receiving a shipment of flour involves a cost of $10 per order. Annual carrying costs are $75 per bag.
Discuss the purpose and significance of those conferences.
it is estimated that 20 of the athletes competing in a large tournament are users of an illegal drug to enhance
Hypothesis testing in areas such as medicine, courts, marketing analysis. How might hypothesis testing be used to determine where to put stop lights?
Write the steps needed to construct an empirical sampling distribution of the range. What is the name of the standard deviation of this sampling distribution?
The mean return for a random sample of 33 mutual funds is 14.93 percent with a standard deviation of 9.57. Build a 95 percent confidence interval for mu, population mean.
Scores on the Math Achievement Test form a normal distribution with a mean of u = 300 and a standard deviation of a = 100. What score separates the top 10% of the distribution from the rest.
Find the critical values necessary to construct a 95% confidence interval for the ratio of population variances.- Construct the confidence interval.
a box contains 10 chips. the chips are numbered 1 through 10. otherwise the chips are identical. from this box we draw
Table 7.28 is from a General Social Survey. Subjects were asked whether methods of birth control should be available to teenagers between the ages of 14 and 16, and how often they attend religious services.
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