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An independent-measures research study was used to compare two treatment conditions with n=12 participants in each treatment. The first treatment had a mean of M=55 with a variance of s2=8, and the second treatment had M=52 and s2=4. Do these data indicate a significant difference between the two treatments? use a two-tailed test with α =.05. (Note: Because the two samples are the same size, the pooled variance is simply the average of the two sample variances.) Be sure to show all formulas with symbols (and plug in numbers), steps, processes and calculations for all parts (including pooled variance) of the answers.
A doctor has appointments at 9 and 9:30. The amount of time each appointment lasts is exponential with mean 30. What is the expected amount of time after 9:30.
1. what percentage of people falls between -2 and 2 standard deviations on iq scores if the general population of iq
Find the population mean for salary. (Note: In real life, you usually cannot find the population mean. We are peeking "behind the scenes" here.)
[1] Assume that we collect a large (n> 30) simple random sample of annual incomes of adults in the United States. Because the sample is large, can we approximate the distribution of these incomes with a normal distribution? Why or why not? Expl..
The Card structure below represents a playing card with a face value and a suit. Using the main code given, set the cards in the deck array to be one of each kind of playing card.
Based on your confidence interval in (6), is it reasonable to say that half of the citizens of Pandora would support the building of a nuclear power plan in the city to generate future power requirement? Explanin how you made your decision.
for the chi-square test for goodness of fit what is the value of df for a test with four categories and a sample of n
The personnel manager for a large company is interested in the distribution of sick-leave hours for employees of her company.
Assume the single pineapple is selected at random from last year's crop. Determine the probability that it weighs more than 35 ounces?
Test the financial analyst's belief that the average rate charged by credit cards with monthly fees is less than 14%. Use a 5% significance level.
penner and watts 1991 investigated whether the time to drill holes in rock differs using dry or wet drilling. in dry
Suppose you have a design with k = 1 factor and n = 3 points located at x = -1.0 + I. Given ·a straight line model sketch the information function.
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