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Amazon has as a target an order fill rate of 97% or more (fill rate is the percentage of complete orders shipped). The management of the Arizona warehouse believes its making that target. A sample of 25 orders resulted on a mean fill rate of 96.5%. The known standard deviation for fill rate is 1.5%.
a) Develop the null and alternative hypothesis.
b) What is the p-value?
c) At a = 0.05 what is your conclusion?
d) At a = 0.01 what is your conclusion?
WidgeCorp is considering branching out into cold beverages. You have been asked to come up with a regression model to forecast monthly sales of cold beverages for the next year. Think about what variables you might include in your model.
Life Expectancy 2004. Data from the World Bank for 26 Western Hemisphere countries can be used to examine the association between female Life Expectancy.
Extract from published statistics, indices showing monthly changes in prices and average earnings since January 2005. a. Rebase these indices so that the current year becomes the base year, stating any assumptions made.
Determine the calculated value of the test statistic? What distribution does test statistic have when null hypothesis is true?
from 8 names on a ballot a committee of will be elected to attend a political national convention. how many different
Family Size. A family is defined to be a group of two or more persons related by birth, marriage, or adoption and residing together in a household. According to Current Population Reports, published by the U.S. Census Bureau, the size distribution..
If researchers want to take a new sample of size 55, what will be the standard deviation of the distribution of the sample mean?
How many units would have to be sampled to be 95% confident that you can estimate the fraction of defective parts within 2% (using the information from today's sample--that is using the result that )?
IQ scores in the population have a mean of 100 and a standard deviation of 15. If Bob has an IQ of 83, what percent of people have scores lower than him? If Sally has an IQ of 97, what percent of people have scores higher than her?
a suppliers process operates at a fallout level of 0.06 defective. lots are required to be shipped from the supplier.
a a conservationist is interested in knowing whether polar bears in the wild have lower rates of reproduction than
a standard slot machine has three reels. the first reel has 3 walnuts 7 cherries 3 oranges 5 lemons 1 bell and 1
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