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Eighty randomly selected batteries were tested to determine their lifetimes. The following frequency distribution was obtained. The data values are in hours. Construct a histogram for the data.
Class Boundaries
Frequency
63.5 - 74.5
10
74.5 - 85.5
15
85.5 - 96.5
22
96.5 - 107.5
17
107.5 - 118.5
11
118.5 - 129.5
5
At the 5% significance level, if the sample proportion is .45, and the standard error of the sample proportion is .035, the appropriate conclusion would be:
Suppose the random variable x is best described by a normal distribution with µ = 24 and σ = 2.7. Find the z-score that corresponds to each of the following x values.
Subjects at both sites were classified as dropouts if they left the study before the conclusion, or completers if they finished the study
Which of the following is the appropriate conclusion from carrying out these multiple comparisons
Can we conclude that mean time for game is less than 3.50 hours? Use.05 significance level.
Make use of normal probability distribution features of EXCEL to help determine the probability.
A committee of three is selected at random from a set consisting of five Democrats, eight Republicans, and two Independents.
Suppose the sample variance for 30 parts turns out to be s 2 = .0005. Use α = .05 to test whether the population variance specification is being violated.
For each problem, compute a Welch F-statistic and determine whether or not significant differences exist among the treatment conditions.
At.02 significance level is it sensible to conclude that mean number of shoes sold at mall stores is larger than at outlet stores?
At.05 significance level, can we conclude that larger proportion of the agents think the economy is expanding this month?
A frequency polygon: does not depend on one variable. True-False
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