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Statistics. A manufacturer claims that the mean lifetime of its fluorescent light bulbs is 1500 hours. A homeowner selects 40 bulbs and finds the mean lifetime to be 1480 hours with a population standard deviation of 80 hours. Test the manufacturers claim. Alpha =0.05.
Using = .05, what is the critical value for the test statistic? (+ or -). State the rejection rule: Reject H0 if z is the lower critical value or the upper critical value.
The average score, in the sample, was 84 with a sample standard deviation of 3.5. The 95% confidence interval for the average examination score of the population of the examinations is?
Calculate a 95% confidence interval for the average lifetime of the washing machines that the company uses. Calculate the sample size required to reduce the margin of error for a 95% confidence interval down to 7 (i.e. E = 7).
Some people who bought X-game gaming systems complained about having received defective systems. The industry standard for such systems has been 98% non-defective systems.
Test whether there is a statistical difference between the two proportions at the 5% significance level.
In Gallup polls taken at different times, subjects were asked if they owned a gun, and the number of yes responses was recorded for each time period. Is this discrete or continuous? why?
The national average for the price of a gallon of unleaded regular gas is $1.16. I believe the price is higher in my area of the country. I want to test my claim by randomly selecting gas prices for 25 stations in my area. The following prices are..
Explain how we can approximately do this by a double sampling scheme that first takes a subsample of size 30 and then chooses the total sample size by using the results of the first subsample.
A jar contains 12 marbles, 5 of which are blue and 7 of which are red. If 4 marbles are chosen at random and without replacement, what is the probability of selecting 3 blue ones and 1 red one?
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments. You are given the results below.
assume the distribution of heights among all 15 year old boys is normally distributed with mean 67 and standard
Estimate the probability the store will gross over $850 a) At least 3 out of 5 business days.
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