Values of a normal distribution
Find the Z-score for the number that is less than only 1% of the values of a normal distribution.
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Do these data present sufficient evidence to indicate the difference in means of closing prices of the two stocks. Perform the hypothesis testing with alpha=0.05. Assume that population variances are not the same.
Use a standard deviation = 30 mg/dL and find a 99% confidence interval for the average cholesterol level of all children whose father has had a heart attack with cholesterol level above 250. (Please give responses to 3 decimal places)
A light bulb is advertised as lasting an average of 1000 hours with a standard deviation of 150 hours. Find the probability of buying a light bulb that will last between 925 and 1150 hours. Assume the variable is normally distributed.
A researcher decides to test her hypothesis that some toys are more fun to play with than others, so she decides to compare fun toys or blocks with unfun toys or stuffed animals.
A certain colege has 490 of the 584 freshman return as sophomores. Does this college have a right to brag that it has an unusually high retention rate?
The company explains that although this proportion is lower than it might wish, its not a surprising value given that only 36% of all its employees are women. The company has more than 500 executives worldwide. Please show you you came up with the
How will the estimated coecient for iron change after the iron variable is re-scaled. What effect would that have on our conclusions about the model.
In exercise 2.100a, you computed the interval, mean ± 2s. Explain why this formula should not be used as an interval estimate for the target parameter. Calculate a 90% confidence interval for the target parameter. Interpret the result.
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