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Four brands of lightbulbs are being considered for use in the final assembly area of the Ford F-150 truck plant in Dearborn, Michigan. The director of purchasing asked for samples of 175 from each manufacturer. The numbers of acceptable and unacceptable bulbs from each manufacturer are shown below. At the 0.05 significance level, is there a difference in the quality of the bulbs?
a random sample has been taken from a normal distribution. output from a software package is given belowvariable xn
The pooled variance of two samples is:
A manufacturer claims that the mean life of batteries manufactured by his company is at least 44 months. A random sample of 40 of these batteries was tested, resulting in a sample mean life of 41 months with a sample standard deviation of 16 month..
the bailey agency is studying long distance calls made from there office. they find that the length of calls follows a
Testing for population mean - What happens as you use different levels of significance? Different values of the standard deviation?
Find the P value or an interval containing the P value for the sample test statistic.
Find the closest point of the surface: xy + xz + yz = 1 to the origin.
Do the following: (a) Make a scatter diagram of the scores; (b) describe in words the general pattern of correlation, if any; (c) figure the correlation coefficient.
The original simple form of the Connecticut state lottery (ignoring a few gimmicks) awarded the following prizes for each 100,000 tickets sold. The winners were chosen by drawing tickets at random. If you hold one ticket in this lottery, what is y..
The standard deviation is 4. what is the best point estimate of the mean? find the 95% confidence interval of the mean score for golfers.
Suppose that 15% of all adults jog. An opinion poll asks a simple random sample of 500 adults if they jog. What is the sampling proportion in the sample who jog?
The mean wait time was 60 minutes and the standard deviation was 10 minutes. How many patients waited between 50 and 70 minutes?
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