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A buyer suspects that the factory's claimed life of mean is 3000 hours for these light balls are too high. To check the claim, the factory tests 50 of these light balls and gets a mean lifetime of sample mean = 2988 hours and a standard deviation of s = 155 hours. What can the factory conclude at the 0.01 level of significance if they test the null hypothesis mean = 3000 hours again an appropriate alternative?
If the standard deviation is 20 pounds, and the weight gain is normally distributed, how many hogs should receive the new experimental diet?
According to Example 12, a normal distribution with mean 115 and standard deviation 22 hun- dredths of an inch describes variation in female salmon growth in fresh water.
The US Census Bureau announce that the median sales price of new houses sold in April 2009 was $221,600 while the mean sales price was $274,300. Assume that the standard deviation of the prices is $90,000.
A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years.
Find the pdf of X+Y - Two independent uniform random variables
Population and the sample proportion of grandparents as primary caregivers (-hat) is to be calculated. What is the mean of the sampling distribution of -hat?
If a total of more than 4 cars are in line (including the car at the window) a car will not enter the line. It takes an average of 4 minutes(exponentially distributed) to serve a car. What is the average number of cars waiting for the drive-in win..
a researcher is interested in finding out whether the variance of the annual repair costs also increases with the age
a survey was completed and the following two wage classes were used 4 - 7 and 7 - 10. what is the class interval for
Convert the binary response variable to a 0/1 continuous response and try some of the standard smoothing methods, such a spline fit to investigate the general form of the response. Does it look logistic?
For the samples summarized below, test the hypothesis that the two variances are equal, at α = 0.05
The population is 500 pounds. At a 80% level, how many elephants need to be weighed so the average weight will be accurate to within 350 pounds?
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