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A market research firm is investigating the appeal of three package designs. The table below gives information obtained through a sample of 200 consumers. The three package designs are labeled A, B, and C. The consumers are classified according to age and package design preference.
A B C TotalUnder 25 years 22 34 40 9625 or older 54 28 22 104Total 76 62 62 200
If one of these consumers is randomly selected, what is the probability that the person prefers design A and is under 25?
X has a normal distribution with a mean of 80.0 and a standard deviation of 3.5. Find the following probabilities:
In a survey on the quality of customer service at Car Toys, customers were asked to rate the service on a scale from 1 to 10, with 10 being that a customer was completely satisfied.
A shipment of 10 items has two defective and eight nondefective items. In the inspection of the shipment, a sample of items will be selected and tested. if a defective item is found the shipment of 10 will be rejected.
In a poll of 150 randomly selected adults 78 said they favored a new proposition. compute a 95% confidence interval for the proportion of all adults in favor of the proposition at the time of the poll.
A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a test of significance.
Is there reason to believe there is a positive linear correlation between the number of t.v. commercials and the sale of this product?
The average number of miles that 90 truckers drove in a day was 540.0 with a standard deviation of 40 miles. What is the 99% confidence interval of the true mean number of miles driven by all truckers?
Can we conclude a difference in means? YES or NO (circle one)
Conduct a one-tailed hypothesis test for the mean at the .025 significance level. State the null and alternative. State the critical value. Draw a diagram. Provide the computation of the test statistics. State your decision in terms of the null hy..
NCAA Football Coach Salaries: Given below are annual salaries for simple random sample of NCAA football coaches (Based on data from USA). How do mean and median change if highest salary is omitted?
What is the likelihood the sample mean is greater than $22.50 but less than $25.00?
Using the empirical rule what percentage of adults is 25 - 45 has iq score bet 70 and 130.
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