Estimate the true proportion of home
A report states that 38% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 4% with 95% confidence?
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Eighteen percent (0.18) of the students in a management class are graduate students. A random sample of 6 students is selected. Use the binomial probability formula to determine the probability that the sample contains exactly 2 graduate students.
Only 6% of calls made to residential numbers in New York City reach a person. What is the probability (±0.0001) that none of 6 calls made to New York City reaches a person?
Give the lower bound of the 95% confidence interval for the true proportion of all CEOs who have MBAs. Take all calculations to three decimal places.
It's believed that that the mean number of dogs owned by dog-owning households is 2.1 dogs. An SRS of 35 dog owners has xbar =2 and s=.29. Carry out an appropriate test to see if the mean number of dogs owned by dog-owning households is something
The average number of mosquitos in a stagnant pool per square meter with a standard deviation of 8. If a sample of 25 square meters are chosen at random for a mosquito count, find the probability that the average of those count is more than 71.3 m
About how many of the 100 90% confidence intervals would fail to capture the true population proportion?
To address this question, the professor gathers information from the students in an undergraduate course and calculates their propensity for cooperating with the police (higher number means higher level of cooperation) and compares it to the known
Find the critical value from Table L for the rank correlation coefficient, given sample size n = 9 and alpha = .05.
Participants were not told which type of tea they had, and were asked to drink one cup of tea per day for a month. At the end of the month, a psychologist evaluated them to determine if their mood had improved. The psychologist did not know which
You want to test the effects of water aerobics on resting heart rate. You decide to test two different levels of exercise (water aerobics for 30 minutes twice a week and water aerobics for 60 minutes once per week.) You randomly find a group of 60
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