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A firm sells detergent packed in two plants. From past experience, the firm knows that the amount of detergent in the boxes packed in the two plants is normally distributed.
The firm takes a random sample of 25 boxes from the output of each plant and finds that the mean weight and standard deviation of the detergent in the boxes from plant 1 is 1064 g (2.34 lb) and 100 g, respectively. For the sample in plant 2, the mean is 1024 g and the standard deviation is 60 g.
- Can the firm claim with a 95% level of confidence that the boxes of detergent from plant 1 contain more than 1000 g?
- Test at the 95% level of confidence that the amount of detergent in the boxes of both plants is the same.
Airplane Safety: Suppose that 62% of all adults think that airplanes would be safer places if pilots carried guns. An opinion poll plans to ask an SRS of 1009 adults about airplane safety.
A random sample of 50 students from this school was selected, and the mean math SAT score was 530. Is the high school justified in its claim? Explain.
A computer diskette manufacturer is concerned that some diskettes have bad sectors that would cause a diskette to hold less information than it was intended to hold.
Of 144 adults selected randomly from one town, 31 of them smoke. Construct a 99% confidence interval for the percentage of all adults in the town who smoke.
Erthromyacine is a drug that has been related with side effects during pregnancy. Assume that 30% of women experience side effects between the 24th and 28th week of pregnancy.
How many hunters must be included in the survey? Assume that data gathered in earlier surveys have shown € to be approximately 10.
question a researcher is interested in comparing the christian maturity level of students who volunteer for community
suppose a manufacturing company makes a certain item. the time to produce each item is normally distributed around a
Compute standard normal z-score corresponding to value of x = 23. e. Determine P(x 23). G. Determine P(16
What is the value of the population mean? What is the best estimate of the value?
just before a city referendum on a school budget a local newspaper polls 372 voters in an attempt to predict whether
for a particular instant lottery the bettor can determine immediately whether a purchased ticket is a winning ticket.
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