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Testing equality of two means.
An independent testing agency has been contracted to determine whether there is any difference in gasoline mileage output of two different gasolines used in the same model automobile. The first gasoline was tested on 200 cars and produced a sample average of 18.5 miles per gallon with a standard deviation of 4.6 miles per gallon. The second was tested on a sample of 100 cars and produced a sample average of 19.34 miles per gallon with a standard deviation of 5.2 miles per gallon. At the .05 level of significance, is there evidence of a difference in performance of the two gasolines?
If one invested in Stock A, Determine standard deviation of percentage return?
We want to test the hypothesis that population B has a smaller variance than population A.
What is the probability that all three students pick exactly the same card?
Gigi has rolled a natural on four straight tosses of the dice. This excites the gamblers standing around the table.
Create probability tree showing all marginal, conditional, and joint probabilities. Create a joint probability table.
Statistics is science of conducting studies to: Solve a system of equations.
At 5% level of significance, is there evidence of difference in mean life of bulbs made by the 2 kinds of machines. What is your conclusion?
To estimate the mean of the population from sample information, we need to calculate the standard deviation of the distribution of the sample means around the population mean.
Based on the answers to a through d, decide whether or not to reject the null hypothesis at the given significance level. Explain your conclusion in the context of the problem.
Does the data prove a significant difference in mean times?
How much net profit can John expect (on average) to earn from the store in total over the next five years?
Construct a 95% confidence interval estimate of their mean weight.
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