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Suppose it is know from past research that the average cold lasts 5.7 days with a standard deviation of 2.3. A researcher takes an SRS of 50 children at an elementary school who had a cold this past winter and found out how long their cold symptoms lasted. Assuming that the Central Limit Theorem applies, give the sampling distribution of X for n = 50.
State the hypotheses for a right-tailed test. Obtain a test statistic and p-value assuming equal variances. Interpret these results. Is the difference in mean scores large enough to be important?
A biologist estimates that 50% of deer in the region carry a certain type of tick. for a sample of 300 deer selected at random, what is the chance that 155 or fewer deer have this tick?
The Manager of a seafood restaurant was asked to establish a pricing policy on lobster dinners. Experimenting with prices produced the following data:
The number of customers at a specialty meat store averages about 1500/day. The exact number varies from day to day. On Fridays before long weekends, the number of customers increases to about 3000. Which of the following statements is correct
The publisher reports that 80% of college professors require or recommend that their students purchase some type of textbook package.
hen investigating a relationship between birth weight and IQ, researchers found that 258 subjects with extremely low birth weights (less than 1000 g) had Wechsler IQ scores at age 8 with a mean of 95.5 and a standard deviation of 16.0.
A campus organization will select one day of the week for an end of year picnic. Assume that the weekdays, Monday through Friday, are equally likely and that each weekend day
A presidential candidate's aide estimates that, among all college students, the proportion p who intend to vote in the upcoming election is at most 65%.
Ten different people's income tax returns are done by each of the three software packages and the time is recorded for each. Which of the following is true?
High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours
Find a 95% confidence interval for the population mean concentration of uric acid in this patients blood. What is the margin of error?
Play 100 games of scraps and empirically determine an estimate for the probability of winning.
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