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A recent national survey found that high school students watched an average (mean) of 6.8 videos per month. A random sample of 36 college students revealed that the mean number of videos watched last month was 6.2, with a standard deviation of 0.5. At the .05 significance level, can we concluded that college students watch fewer videos a month than high school students?
If I use the 5 steps of hypothesis how would I start this?
A shoe salesman want to see if his female customers have a preference in the color of shoe purchased. What is the test value for the following data?
A standard IQ test has mean of 98 and a standard deviation of 16. We want to be 99% certain that we are 8 IQ points of the true mean. Determine the sample size.
What is the P-value of the test, assume the standard deviation is 3 years, a 95% confidence interval for the average time
According to a survey reported in the Business Week, 30% of adults in the U.S. said that the cell phone is the invention that they hate most but cannot live without.
We have already been introduced to sensitivity analysis via the geometry of a simple example. We saw that the values of the decision variables and those of the slack and surplus variables remain unchanged even though some coefficients in the objec..
A financial analyst estimates that the probability that the economy will experience a recession in the next 12 months is 20%. She also believes that if the economy enters a recession
what is the required sample size is the error is to be less than 1/2 hour with a 95% level of confidence?
A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of u = 80 and a standard deviation of o= 20. The researcher expects a 12 point treatment effect and plans to use a t..
In each month, the proportion of "Prize" bonds that win a prize is 1 in 11000. There is a large number of prizes and all bonds are equally likely to win each prize.
Given CAPM as the benchmark, is either of the two managers over-performing the market? What if you use the Sharpe Ratio as benchmark? Explain the answer carefully.
Determine and plot the probability mass function and probability distribution function of the contract award amount (in millions of dollars).
a) Set up the null and alternative hypotheses, and perform the hypothesis test. b) Does the jury selection system appear to be fair?
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