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1. What is a sampling distribution, and what are the uses of sampling distributions?
2. A sample of size n = 5 is selected from a population. Under what conditions is the sampling distribution of X‾ normal?
Statistics and Probability, Statistics
Now assume that I am talking about a normally distributed set of data: An IQ test. This IQ test has a mean of 100 and a standard deviation of 15. Find the following probabilities What is the probability that someone scor ...
In a survey of 3153 adults, 1407 say they have started paying bills online in the last year. Construct a? 99% confidence interval for the population proportion. Interpret the results. A? 99% confidence interval for the p ...
In order to fund her retirement, Helen needs her portfolio to have an expected return of 13.8 percent per year over the next 30 years. She has decided to invest in Stocks 1, 2, and 3, with 25 percent in Stock 1, 50 perce ...
The National safety council reported that 52% of American turnpike drivers are men. A sample of 300 cars traveling southbound on the New Jersey Turnpike yesterday revealed that 170 were driven by men. At a 99% level of c ...
In a sample of 20 cups of coffee at the local coffee shop, the average temperature was 162.5 degrees with a standard deviation of 14.1 degrees. What would be the 95% confidence interval for the temperature of your cup of ...
The following data represents rain fall (x) and yield of paddy per hectare (y) in a particular area. X 113 102 95 120 140 130 125 Y 1.8 1.5 1.3 1.9 1.1 2.0 1.7 Fit the regression equation x and y. Estimate Y when x= 145. ...
A Travel Weekly International Transport Association survey asked business travelers about the purpose for their most recent business trip. 19% responded that it was for an internal company visit. Suppose 950 business tra ...
A researcher reports that the size of an effect in Population A is d = 0.10 and the effect size in Population B is d = 0.34. Which population is associated with greater power to detect an effect? A) Population A B) Popul ...
Question 1 Below you are given the examination scores of 20 students (data set also provided in accompanying MS Excel file). 52 99 92 86 84 63 72 76 95 88 92 58 65 79 80 90 75 74 56 99 a. Construct a frequency distributi ...
We want to estimate the mean weight of all 7th grade boys in a city. It is not known whether the distribution of the weights is normal or not. Suppose we have a random sample of 64 boys from 7th grade from that city and ...
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