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A randomly selected value froma normal distribution is found to be 2.1 standard deviations above its mean.
a. what is the probability that a randomly selected value from the distribution will be greater than 2.1 standard deviations avoe the mean?
b. What is the probability that a randomly selected value from the distribution will be less than 2.1 standard deviations from the mean?
For a given confidence interval, what is the interpretation of a 96% confidence level?
Fred received the following scores for his gymnastics routine: 8.5, 7.8, 8.0, 6.8, 7.1, 7.6. To figure out his score, the judges drop the highest and lowest score and then average the rest of his scores.
According to an IRS study, it takes a mean of 330 minutes for taxpayers to prepare, copy and electronically file a 1040 tax form. This distribution of times follows the normal distribution and the standard deviation is 80 minutes.
If and are the proportions of all college males and females correspondingly, who worked last summer, the z statistic (±0.01) for a test comparing the proportions of college men and women who worked last summer is??
In baseball, the term "batting average" is employed as one way to measure a player's offensive performance. If we were to consider the idea of batting average in statistical sense
Using sample, determine a 98% confidence interval for mean weight of whole daily output.
Perform a proper analysis. Describe your null and alternative hypothesis, report the p-value. What is your conclusion?
Find a 99% confidence interval estimate of the proportion of people who say that they voted.
A savings account was opened for a baby on 1985 with a $100 deposit. No withdrawals or deposits occurred since the account was opened. The current balance of the account is $246.47. Measured in dollars of the year in which the account was opened, how..
Construct a 95% confidence interval for the proportion and calculate the P value for the given test.
10 cartons are taken at random from an automatic filling machine.The mean net weight of the carton is11.8 kg and standard deviation of 0.15kg. Does the sample mean differ significantly from the intended weight of 12kgs?
Determine probability that student was sophomore? Determine the probability of selecting a face card from deck of 52 cards.
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