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A weatherman stated a null hypothesis that during the month of September, the mean daily temperature of Boston was the same as the mean daily temperature of New York. His alternative hypothesis was that the mean temperature in these two cities were different. He computed a p-value of 0.094. Using a confidence level of 90%, he should conclude:
Which of the following descriptions of confidence interval is correct?
Imagine a researcher presented a null hypothesis that in a certain community, the average energy expenditure of residents is at least 2100 calories per day. He randomly sampled 100 residents in that particular community. He computed a negative test statistics and associated p-value was 0.08. Given 90% confidence level, he should conclude:
In a statistical hypothesis test, how is the rejection region impacted when the level of significance is increased?
Compute and compare the proportions of head injury for the group with helmets versus the group without helmets. What would be your conclusion?
Assume then money spent is uniformly distributed between these amounts. Determine the mean amount spent on insurance?
Imagine you are a manager at a major bottling company. Customers have begun to complain that the bottles of the brand of soda produced in your company contain less than the advertised sixteen (16) ounces of product.
Assume the population standard deviation (s) is 0.5 and the sample size (n) is 100. Calculate the values for alpha, a type I error and beta, a type II error. (To calculate Beta, consider a mean that is 1 standard error away from the lower end valu..
Supposes that the diameter of bearings are independent normally distributed random variables with mean µB = 1.005cm and variance σ²B = (0.003)² cm² . The diameter of shafts are independent normally distributed random variables having mean µB = 0.9..
in a poll of n 200 randomly selected individuals 60 people said they are opposed to the death penalty for persons
If only one spark plug fails, the plane will shake and not climb higher, but it can be landed safely. What is the probability that this happens? Calculate using the appropriate formula.
run a regression of the dependent variable on the continous and categorical independent variables. what conclusion can
What is the probability that between 5 and 10 firms, inclusively, purchase a Unix machine from Sun Microsystems?
The assembly time for a product is uniformly distributed between 6 to 10 minutes.
Construct the ANOVA table (i.e. compute the between and within SS) and test if there appears to be any differences in means (use α = 0.05)
someone working for a survey organization approached thefirst 100 students they saw on campus and noted that 52 of
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