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A sample of 100 $1.00 bills from a Subway cash register revealed that 16 had something written on them besides the normal printing. At significance level of 0.02, is this sample evidence consistent with a hypothesis that 10% or fewer of all dollar bills have anything written on them besides the normal printing?
The route used by a certain motorist in commuting to work contains tow intersections with traffic signals. The probability that he must stop at the first signal is 0.4, the analogous probability for the second signal is 0.5. and the probability th..
Which of the following(s) can be considered (a) variable(s)?
Describe expected value (EV) of an investment if there is a 20% chance of realizing a return of $20,000 or a 55% chance of realizing a return of $25,000, or there could be a loss of $15,000?
To conclude the effect of a new fertilizer on productivity of tomato plants one group of plants is treated with the new fertilizer as a second group is grown without such treatment. The number of ripe tomatoes produced by each group is counted.
If the manufacturer sells the parts in packages of 10 parts, what are the mean and standard deviation of the numberof useable parts in a package?
What sample size is recommended for the hypothesis test (0 decimals)? Use 30 hours as an estimate of the population standard deviation.
What is the probability that a red ball will be chosen? If we randomly select 5 balls with replacement, what is the probability distributon of x-the neumber of red balls in the sample?
Will the distribution of x bar always be approximately normally distributed, or does it depend on the distribution of the population?
Propose a two sample z-test of a population mean and identify it as either an independent test or a dependent test.
If the population is normally distributed then the sample mean is also normally distributed even for small sample size.
Whose characteristics can be assume to be independent of each other, were examined. Let X denotes the number of defective computer chips.
10% of the north district students failed, 15% of the south district students failed, and 5% of the central district students failed. Develop a joint probability table.
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