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At Smart University, all new freshmen are given an English proficiency exam during the week of registration. Scores are normally distributed with a mean of 70 and a standard deviation of 10.The university has decided to place the top 25% into honors English and the bottom 20% into remedial English. What scores separate the upper 25% and lower 20% of the students from the rest?
Suppose we have data from a sample. The sample mean is 15, and the error bound for the mean is 3.2. What is the confidence interval estimate for the population.
An article in the Sacramento Bee (Stafford, 2003) on July 7, 2003 reported that the current minimum wage is only $5.15 an hour and that it has not kept pace.
Based on a simple random sample of one hundred an analyst estimates the average hourly wage earned by workers in a city to be $30 and computes the margin of error to be $5.
a doctor wants to estimate the hdl cholesterol of all 20- to 29-year-old females. how many subjects are needed to
State the symbols for the one mean and then the 10 means.
The average attendee spends $10 on food and drink at the game, and the team receives 30 percent of the gross food and drink revenues.
Find the parameters of a variable sampling plan, assuming the first of the two conditions is to be satisfied exactly. A random sample of 17 wafers yielded an average of 0.013 mm. Describe the decision regarding the lot based on Forms 1 and 2.
Using the results, describe the effect of an outlier or extreme value on the confidence interval.
Find the pdf of X+Y - Two independent uniform random variables
In a sample of 14 of the bowling balls the sample standard deviation was found to be 0.52 pounds. Construct a 95% confidence interval for the variance of the bowling ball weight.
Explain whether p^ or p is the correct statistical notation for each proportion described:- The proportion that smokes in a randomly selected sample of n = 300 students in the eleventh and twelfth grades.
Let An be an increasing sequence of σ-algebras whose union generates a σ-algebra S. Let µ and ν be probability measures on S such that ν is singular with respect to µ on S, but absolutely continuous with respect to µ on each
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