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According to a study by Decision Analyst, 21% of the people who have credit cards are very close to the total limit on the card(s). Suppose a random sample of 600 credit card users is taken. What is the probability that more than 150 credit card users are very close to the total limit on their card(s)?
Recognize and explain potential threats (up to 3) to external validity.
use two sums from part A and the computational formal to compute sum of square (SS)for the scores.
A consumer protection group is concerned that a ketchup manufacturer is filling its 20-ounce family-size containers with less than 20 ounces of ketchup.
Following sample data shows the weekly closing price of ABC stock. Compute the sample mean and variance from this data set.
Use a 0.05 significance level to test the claim that the heights of female supermodels vary less than the heights of women in general. The standard deviation of heights of the population of women is 2.5 in.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
Assume the least squares equation is Y' = 10 + 20X. What does the value of 20 indicate?
An insecticide company exposes 10,000 cockroaches to its newest product, and exposes another 10,000 to their previous formula.
A population of data from a paper supply company is known to have a mean weight of 55 ounces per ream and a population standard deviation of 5 ounces. The population is known to be bell shaped and symmetrical.
Formulate the hypotheses to determine whether or not the lathe is in perfect adjustment.
In its third year, a football team averaged 16,050 fans per game, with a standard deviation of 2,500 fans. What is the probability that the number of fans at any given game was greater than 20,000?
One professor teaches a large section, section A, of a particular class, and on the first test of the term, the test scores in section A were approximately normally distributed with a mean of 78 and a standard deviation of 6.
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