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Q1) In past, percent of smokers able to give up smoking "cold turkey" was reported to be no more than 0.10. If we wanted to make new estimate of that percent that now were able to give up "cold turkey" with precision (margin of error ) of plus and minus 0.02 and with 99% confidence, how large sample would be required? What sample size would be needed to make that evaluated within plus and minus 0.03 and with 95% confidence?
Q2) Job training program trained thousands of participants. After training was completed, random sample of 64 of these participants illustrated that only eight had retained jobs in which they were placed for more than three months. If we wanted to evaluate the percentage of trainees retaining jobs for more than three months (suppose that 64 comprised random sample of all trainees) with 95% confidence, what would that evaluation be and what is the margin of error?
Suppose that an IQ test was given to a large group of persons, the scores are assumed to be from a normally distributed population, that mean = 100 and s (standard deviation) = 15.
A random sample of students is selected, and each one is asked to try first brand A and then brand B, or vice versa with the order determined at random.
What is the probability that the project will be completed in 17 months or less?
Based on surveys conducted in 1989 and 1999, a researcher compared the proportion of high school age females interested in a career in science in 1989 with the proportion in 1999. He concluded that the proportions were not significantly different ..
Suppose we drew a histogram of these 18 death rates using class intervals 1 — 1.9, 2 — 2.9, 3 — 3.9, 4 — 4.9 and 5 — 5.9. Using the histogram, we would
A survey taken in a restaurant shows the following number of cups of coffee consumed with each meal. Construct an ungrouped frequency distribution.
Do you benefit by using a cum sum chart rather than a control chart?
There are two telephone lines A and B. Let E1 be the event that line A is being used and E2 be the event that line B is being used
CASE STUDY: Are the Fish Safe to Eat? Assessing which Factors affect Mercury Levels in Fish in Maine Lakes.
Solve this problem explicitly using all five steps of hypothesis testing, and illustrate your answer with a sketch showing the comparison distribution
Assume that the measurements came from a normal distribution. The variability of the manufacturing process is unknown means the same as the standard deviation is unknown.
Let be the average of the pay you receive for the first and second week. Find the sampling distribution
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