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A sample of 15 teachers from Rhode Island has an average salary of $35,270, with a standard deviation of $3256. As ample of 30 teachers from New York has an average salary of $29,512, with a standard deviation of $1432. Is there a significant difference in teacher's salaries between two states? Use a = 0.02. Find the 98% confidence interval for the difference of the two means.
Determine the minimum sample size to construct a 90% confidence interval for the population mean. Assume the population standard deviation is 1.2 years.
The events A and B are independent, mutually exclusive or both. If two events A and B are mutually exclusive (A B = ), then they cannot be independent if P(A) > 0 and P(B) > 0. Why?
The Investment Research Institute reported in its Mutual Fund Fact Book that the number of mutual funds increased from 5725 in 1999 to 7977 in 2009. What is the geometric mean annual percent increase in the number of funds?
Standard deviation of 24 min. What is the probability that a random sample of n=15 batteries results in a mean talk time of at least 330 minutes?
a scientist attempts to perform a difficult experiment. she is successful in about 80 of her attempts. she attempts the
Also, the sample data appear to have a bell-shaped distribution. Construct the 95% confidence interval for the mean time spent on paperwork by all managers.
Why do we need a new test method to compare the means of 3 or more populations? Why can't we just use a series of z-tests or t-tests to compare all of the possible pairs of population means to see if one (or more) is different?
A company selects five of the machines at random, thinking all are in working condition. What is the probability that all five of the machines are nondefective?
A box of 9 gloves contains two left handed gloves and seven right handed gloves. If two gloves are randomly selected from the box, without replacement, what is the probability that both gloves will be right handed?
In this group four were African American, 6 were hispanic, and one was Asian. Was this a good sample on which to norm this test? why or why not? What are your suggestions?
Descriptive statistics for given data - Evaluate the range, variance, and standard deviation of the data set. Interpret the results in the context of the real-life setting.
Based off the three requirements that must be met before an analysis of variance test (ANOVA) can be used: Samples must be randomly selected from the populations to be evaluated.
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