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A new drug to treat high cholesterol is being tested by pharmaceutical company. The cholesterol levels for 27 patients were recorded before administering the drug and after. The mean difference in total cholesterol levels (after - before) was 1.544 mg/dL with a standard deviation of 7.6237 mg/dL. Create a 99% confidence interval for the true average difference in cholesterol levels by the drug.
1) (2.5329, 5.6209)
2) (-2.5329, 5.6209)
3) (-2.5211, 5.6091)
4) (-1.2347, 4.3227)
5) (0.0768, 3.0112)
Determine the probability that the project will be completed in 90 days or less.
the ages and heights of a sample of child smokers were taken. the average age was 13.5 years with an sd of 2.3 years.
Distinguish the various observational study designs and the randomized controlled trial with regard to validity and feasibility.
The manufacturer of Winston Tire Company claims its new tires last for an average 40,000 miles. An independent testing agency road-tested 20 tires to substantiate the claim made by the Winston Tire Company.
question 1 given a binomial random variable with n10 and p .3 use the formula to find the following probabilitiesapx
You're given that the forecast for the current period of 70 turned out to be 6 units less than the actual demand. The forecast for the next period is 75.8.
A manager of a large department store with three floors reports that the time a customer on the second floor must wait for an elevator has a uniform distribution ranging from 0 to 16 minutes. It takes the elevator 1 minute to go from floor to floo..
Find a 95% confidence interval for the difference between this year and last year in the mean number of units sold at all retail stores and interpret the results.
If H0 is in reality false and it is legitimate to use a directional H1, which of the following will yield a more powerful test? one-tailed alternative hypothesis
Expand the above table to show the change in Ms A's investment portfolio over the year, and construct a suitable diagram to illustrate that information.
at a community college it is known that the grade point average gpa of all students has a distribution which is both
Use your results from #2 as estimates for μ and σ. Find the probability that a sample of 36 statistics students at DTCC has a height of 65 inches or taller.
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