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H1: the cost of gasoline will decrease or stay the same over the next 30 days because of summer holiday travel.
What is your alternative hypothesis statement?
Looking for a good original (yet cited) response to this definition. And if you can describe two common ones with an example for each that would be great.
If the mean lifetime of this type of component is 100 hours and its standard deviation is 19 hours, how many of these component must be in stock so that the probability of the system is in continual operations for the next 2,000 hours is at least ..
A person is considering purchasing the stock of two home health companies that are similar in all respects except the proportion of earnings paid out as dividends.
Sampling area consisted of an area of 120m x 50m within site two and was bordered by a road on one side and a stream on another.
To test the difference between two means using two mean z test.
Penultimate Support Systems makes fairly good speaker and equipment support stands for music groups. The assembly process involves two operations
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) both will fail? (b) Neither will fail? (c) One or the oth..
Research question : At α = . 01, is degree of certainty independent of credits earned?
The researchers claimed that of those who completed the program, 85% improved. What possible confounds can you identify in this study?
By using 0.05 level of significance, is there any evidence of difference in mean life of bulbs produced by two kinds of machines?Calculate p-value and interpret its meaning.
Population standard deviation is known to be 8 grams. Determine and interpret p-value for testing that mean weight of Take-a-Bite is less than 175 grams.
In the following observational studies, describe changes that could be made to the data collection process that would result in an experiment rather than an observation study. Also, offer suggestions about unseen biases or lurking variables that m..
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