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A credit card company claims that the mean credit card debt for individuals is greater than$4,900. You want to test this claim. You find that a random sample of 30 cardholders has a mean credit card balance of $5,083 and a standard deviation of $600. At α=0.05, can you support the claim? Complete parts (a) through (d) below. Assume the population is normally distributed.
(a) State H0 and Ha.
(b) Find the criticalvalue(s) and use it to determine the rejection region.
(c) Find the standardized test statistic t.
(d) Decide whether to reject or fail to reject the null hypothesis.
study of people's memory of self rating and actual test
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a. Find the standardized score (z-score), relative to all U.S. births. for a baby with a birth length of 45 cm. b. Find the standardized score of a birth length of 45 cm for babies born one month early, using 47.4 as the mean.
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Plot the four separate time series and describe any trends in the separate time series. Do the trends appear to imply a narrowing in the differences between male and female math scores?
An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed. If a sample of 16 bulbs has an average life of 50 hours and the population standard deviation is known to be 10 hours.
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What is the point estimate of the difference between the two population proportions? Conduct the hypothesis test and report the p-value. At a .05, what is your conclusion
In one of the sections, computer-assisted instruction and review software is utilized; in the other section, it is not. All students are given the same final examination at the end of the semester. Does this represent a designed experiment? Expla..
To test is there any significant difference among two proportions. The Damon family owns a large grape vineyard in western New York along Lake Erie.
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