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A researcher calculates a statistical test and obtains a p value of .86. He decides to reject the null hypothesis. Is this decision correct, or has he committed a Type I or Type II error?
Does Lavastatin reduce the risk of heart attack? In a Texas Study, researchers gave Lovastatin to 2,325 people, and a inactive substitute to 2,081 people, with an average age of 58. After 5 years, 57 of the lovastatin group suffered a heart attack..
Find the 90% confidence interval for the variance and standard deviation for the time it takes a state police inspector to check a truck for safety if a sample of 27 trucks has a standard deviation of 6.8 minutes.
The power generated by a solar electric generator is normally distributed with mean 15.6 kilowatts and standard deviation of 4.1 kilowatts. We may be 95% sure that the generator will deliver at least how many kilowatts?
Explain the difference between the null hypothesis and the alternate hypothesis. How is the null hypothesis chosen (why is it null)? What is the importance of rejecting the null hypothesis in relation of the sample to the population?
q1. you roll a single die numbered from 1 to 6 twice. what is the probability of rolling a six the first time and an
In your environment (business or personal), please give an application of exponential smoothing and why you would use this technique.
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.
a study has indicated that the sample size necessary to estimate the average electricity use by residential customers
Do you think that all random samples taken from the same population will lead to the same result?
The mean on this test is 3.5 with a standard deviation of .5. Sally scores 1.5 on this test. How many standard deviations is Sally from the mean?
11% needed to be serviced once, 5% twice, 4% three times, and none required more than three repairs. what are the expected no of repairs per year.
Considering the four weights and assuming the weights are independent with a constant variance, obtain the least square weights of A and B.
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