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To find out whether the inhabitants of two South Pacific islands may be regarded as having the same racial ancestry, an anthropologist determines the cephalic indices of six adult males from each island, getting 1 = 77.4 and 2 = 72.2 and the corresponding standard deviations s1 = 3.3 and s2 = 2.1. Use the four steps in the initial part of Section 1 and the 0.01 level of significance to see whether the difference between the two sample means can reasonably be attributed to chance. Assume that the populations sampled are normal and have equal variances.
Consider a four digit uniform random number generator; as in each of the 10,000 values 0.0000 through 9999 is equally likely. Find the mean and variance of the values produced by such a random number generator.
If three of these computers are placed in parallel aboard the proposed space station, what is the system reliability for the first 6 months of operation?
In an experiment, subjects are required to generate a "yes" or "no" decision. The probability of 'Yes' being correct is 50%. The observed probability of yes decisions is 70%.
The mean of a normal probability distribution is 60; the standard deviation is 5.
This second sample had an average response of 132 with a sample variance of 16. What is the pooled standard deviation for this problem?
the shape of the distribution of the time required to get an oil change at a 15 minute oil change facility is unknown.
Find the probability that fewer than 10 of those sampled currently have access to online services.
In a survey of 7000 women, 4431 say they change their nail polish once a week. Construct a 90% confidence interval for the population proportion of women who change their nail polish once a week.
Show all the steps of your hypothesis test including a) the claim being tested , b) the null and alternative hypothesis, c) the test statistic, d) the p value, e) initial conclusion, and f) a final conclusion about the original claim.
Criticize the following criteria: (a) Ratings by employees as an index of supervisor's leadership ability
Write 5 page paper describing the antebellum south and the living conditions of slaves. Include a thesis alter the paper around this thesis
Families of size 4 spent a population mean of $360 on a visit to an amusement park, standard deviation of $50 in October 2000. Operators want to know whether families will spend more in 2001.
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