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You are planning on taking an SRS of 100 people from a population that has a mean () age of 40 years and standard deviation () of 15 years. The distribution is slightly skewed, but according to the Central Limit Theorem the distribution of all sample means is approximately normal. Using the distribution of the sample means, according to the 68-95-99.7 rule, how far away are approximately 95% of all of the possible sample means ('s) from 40 years? (This is the MIDDLE 95%).
95% of the possible sample means are within +/- (plus or minus) years from 40 years.
(Hint: how many standard deviations do you need to go from the center to get 95%? Don't forget this is all about the SAMPLE MEANS, not the original population)
Let = the sample mean of the 100 scores from University X, and = the sample mean of the 100 scores from University Y. What is the probability that will x be greater than y?
Complete the simulation Applying Time Series Methodologies located on . During the third cycle of the simulation, you will need to make a decision regarding sales forecasts for Blues Inc.
A retailer finds that the demand for a very popular board game averages 100 per week with a standard deviation of 20. If the seller wishes to have adequate stock 95% of the time.
The average price of a sample of 12 bottles of diet salad dressing taken from different stores is $1.43. The standard deviation is $0.09. The average price of a sample of 16 low-calorie frozen desserts is $1.03.
Suppose you are testing the differences in attitudes toward health care reform using Democrats, Republications, and Independents. What statistical test would you use?
A pinochle deck has 48 cards, two of each of six denominations (9, J, Q, K, 10, A) and the usual four suits. In a hand of 12 cards, what is the probability of getting a "bare" roundhouse, namely a king and queen of each suit and no other kings or ..
If wages were increased by $1.00, what is the expected effect on the number of complaints received per employee? How can you tell?
Find the probability that the first card is a two and the second card is a ten. Round your answer to three decimal places.
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
Calculate the mean, median and mode for both sets and do graph/histogram to chart the results and conclude if indeed one set of year had more the other as far a snowfall.
A population consists of 15 items, 10 of which are acceptable. In a sample of 4 items, what is the probability that exactly 3 are acceptable? Assume the samples are drawn without replacement.
To explain this, be sure to explain whether the null hypothesis should be rejected, the likelihood of that decision being an error, and why it might have been an error.
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