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Question: The proportion of successes in a random sample of 400 was calculated as 50%.
a. Estimate the population proportion with 95% confidence.
b. Repeat part (a) with p = 33%
c. Repeat part (a) with p = 10%
d. Discuss the effect on the width of the confidence interval estimate of reducing the sample proportion.
Assume a normal distribution for pH values. If a random sample of 10 readings in a vat is taken and the mean pH is computed, find each of the following?
Find the expected frequency for each cell and compute X stat square? Is it significant at alpha-0.05?
Identify the sampling distribution to be used: the standard normal distribution or the Student's t distribution. Find the critical value(s).
Test Scores: mean=100 variance = 225 Years of Service: mean=5 variance = 81 Of test scores and years of service, which measure has the greater dispersion?
Think of a case in which regression analysis was used, but not properly. For instance, discuss situations in which regression analysis is not appropriate and does not add useful information to our understanding of a set of data.
The mean monthly income of the trainees of an engineering firm is $600, with a standard deviation of $100. Find the probability that an individual trainee earns less than $500 per month.
To test the null hypothesis that the mean waist size for males under 40 years equals 34 inches versus the hypothesis that the mean differs from 34, the following data were collected: 33, 33, 30, 34, 34, 40, 35, 35, 32, 38, 34, 32, 35, 32, 32, 34, 36,..
Calculate the test statistics
PiggyBank has narrowed its options down to two incentive plans: The bank doesn't know whether consumers would shop online more than at clothing stores.
A research firm conducted a survey to determine the mean amount people spend at a popular coffee shop during a week. They found the amounts spent per week followed a normal distribution with a population standard deviation of $4.
The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees (n = 474) and their starting salaries.
Convert each of the following z intervals to x intervals.
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