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Assume that a simple random sample has been selected from a normally distributed population and test the given claim. Use the P-value method. Identify the null and alternative hypotheses, test statistic, P-value (or range of P-values) as appropriate, and state the final conclusion that addresses the original claim. A large software company gives job applicants a test of programming ability and the mean for that test has been 160 in the past. Twenty-five job applicants are randomly selected from one large university and they produce a mean score and standard deviation of 183 and 12, respectively. Use a 0.05 level of significance to test the claim that this sample comes from a population with a mean score greater than 160. use the P-value method of testing hypotheses.
1. athere are 3 people at a donut shop and they have 5 donuts. how many ways are there to assign donuts to people if
What are the characteristics of a normal distribution? Why is the normal distribution important in statistical analysis? What is the Standard Normal Distribution?
The standard deviation of the population weight losses is about 10 pounds. How large a sample should he take to estimate the mean weight loss to within 2 pounds, with 95% confidence?
Determine the critical z values. Suppose that normal distribution applies. Right-tailed test; standard deviation = 0.04.
a random sample of size 56 from a normal population showed a mean of 63 and a sum of squares of deviation from the mean
over the years grades in an introductory statistics course were recorded and showed the following proportionsa 0.20 b
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Soft Drinks a vending machine automatically pours soft drinks into cups. As the amount of soft drink dispensed into a cup is normally distributed
random sampling from four treatments produced the following
Suppose that the null hypothesis is rejected and that an alternate hypothesis is accepted. Discuss the conclusion as a type I error, a type II error, or a correct decision-if in fact the defendant is innocent.
Which of the following best expresses the value of using percentages in data presentation? A. Provides for the calculation of marginals.
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