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1. A random sample of 20 students yielded a mean of x¯ = 72 and a variance of s2 = 16 for scores on a college placement test in mathematics. Assuming the scores to be normally distributed, construct a 98% con- ?dence interval for s2.
2. that s2= 1 is valid. Assume the population of battery lives to be approximately normally distributed.
two marbles are selected one at a time from a jar of marbles containing 10 black 10 brown 10 white and 10 green
suppose that 12 observations are drawn from a normal population. the observations are 15 912 11 8 12 11 7 15 9 6 and
a nonprofit company concerned with the school dropout rate in a nearby state has designed a tutoring program aimed at
A statistical study reported that a drug was effective with a p-value of .042. (a) Is this true? An effective sample may be found about 42 times in 1000 samples.
Suppose it is desired to estimate the population mean number of miles with a margin of error of ± 2 miles at 95% confidence. Do the data provide this desired level of precision? What action, if any, would you recommend be taken?
emily is interested in understanding if there is a relationship between whether or not people think the diversity
A random sample of 9 homes was selected in the neighborhood. What's an estimate of the average price of the houses in the sample?
The mill has the ability to run the same grade on multiple paper machines. Compare the relationship between the two instruments for the following (consider both average and variability):
The waiting times have a standard deviation of 4.9 minutes. Use a 0.025 significance level to test the claim that with a single line, waiting times vary less than with individual lines.
five students were randomly selected from a large university. the act scores for these students were 23 12 27 32 and
let a be the set of english words that contain the letter x and let b be the set of english words that contain the
Omar Haaris receives 5000 tripods annually from Top-Grade Supplier to meet his annual demand. Omar runs a large photographic outlet, and the tripods are used primarily with 35mm cameras. The ordering cost is $15 per order, and the carrying cost is..
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