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Critically illustrate out the term standard deviation. Define mathematical averages. Why is the standard deviation less than the mathematical average? Why do we use standard deviation? Why do we use a mathematical average?
Calculate the test statistic. Determine the p-value of the test-statistic.
Using sample, determine a 98% confidence interval for mean weight of whole daily output.
Determine the mean for list of numbers. 6, 5, 9, 4, 14, 9 (Round to the nearest tenth)
If the computed value for this problem is +2.33, and the level of significance is 0.05, can we conclude that the recall proportions for the two commercials are same?
How many ways can she choose 4 dissimilar rides if order does not matter? If she has chosen the first weeks rides, how many ways can she choose four more different rides for second week? Suppose that order does not matter.
A bank wants to get new customers for their credit card. They try two different approaches in their marketing campaign. The first promises a "cash back" reward; the second promises low interest rates. A sample of 500 people are mailed the first br..
Is this an ideal data collection method? Can the results be considered reliable? Can the gathered data be representative of the population?
At the .05 significance level, can we conclude that the guideline is still reasonable?
Testing for Population mean - determine if there has been a significant change in the population mean.
Construct a 99% confident interval for the standard deviation of the amount of vitamin B6 per pill.
The lifetime of a 2-volt non-rechargeable battery in constant use has a Normal distribution with a mean of 516 hours and a standard deviation of 20 hours. The proportion of batteries with lifetimes exceeding 520 hours is approximately.
State along statistical certainty there is a difference among the population proportions of those favoring Statement.
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