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The weight of an organ in adult males has a bell shaped distribution with a mean of 310 grams and a standard deviation of 50 grams. Use the Empirical rule to determine what percentage of organs weighs between 260 grams and 460 grams.
for University Y, M = 4, S2 = 1.5; and for University Z, M = 6, S2 = 2.5. What should you conclude? Use the .05 level. (a) Use the steps of hypothesis testing, (b) figure the effect size for the study.
Two independent samples of sizes n1 = 50 and n2 = 50 are randomly selected from two populations to test the difference between the population means. The sampling distribution of the sample mean difference, is:
testing for equality of mean.1. a computer is programmed to make 100 draws at random with replacement from the box
Assume the probability that a telephone in any given telephone booth is defective is 0.2. Determine the probability that if 8 phone booths are examined, the number of defective phones is exactly 3.
What if the size for each sample were increased to 20? Would a sample mean of 115 or more be considered unusual? Why or why not? Why is the Central Limit Theorem used?
A researcher selects a random example of college students and measures number of hours they spend watching television per week and their grade point average.
What is the value of the population mean? What is the best estimate of the value?
It is known that in a sack of mixed bean seeds, 35% are yellow beans. Use the normal approximation to the binomial distribution to find the probability that in a sample of 400 beans there are
The random variable x is the number of houses sold by a realtor in a single month at the Sendsom's Real Estate office. Its probability distribution is as follows.
Half of the college graduates are married. What is the probability that a randomly chosen worker is: Neither married nor a college graduate?
A random sample of 30 students was selected, and the following values were recorded: Is this sample significantly different than the population? State the null and alternative hypotheses.
two towns both have a mean income for their residents of 30000. the standard deviation of incomes of residents in
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