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The bar graph below compares the mean time in seconds for 7-yr old girls to complete a certain task to the mean time in seconds for 7-yr old boys to complete the same task. There is a statistical deception here. Explain what is deceptive about the bar graph.
The mean number of passengers per flight is 160 with a standard deviation of 20. The aircraft used for the route has 200 seats.
At the .05 significance level, can we conclude that the guideline is still reasonable?
Find a 90% confidence interval for the difference between the proportion of men and the proportion of women who approved of Reagan's performance. What assumption do you make to use this method?
Z score on comparison distribution for sample score and your conclusion. Suppose that all population are normally distributed.
The diameters of oranges in a certain orchard are normally distributed with a mean of 5.26 inches and a standard deviation of 0.50 inches.
Determine the probability that computer will fail within 12 months?
What was the highest score earned on the exam? According to Chebyshev's Theorem, how many students scored between 42 and 74?
In Excel, which of the following functions is used to conduct a hypothesis test (using the p -value) for a population variance
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
They find that these 100 people lost an average of 38 hours with a standard deviation of 9.5 hours. What is the P-value for this significance test?
At 0.01 level of significance, is there evidence that mean price is higher at Whole Foods Market than at Fairyway supermarket? Interpret the meaning of p-value in (i).
A processor of carrots cuts green top off each carrot, washes the carrots, and inserts six to a package. Twenty packages are inserted in a box for shipment. To test weight of the boxes, a few were checked.
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