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Would you conclude that your data set is approximately normal? If so, what percentage of your data values lie:
(A) To the left of 1.50 SD-units below the sample mean?
(B) To the right of 1.50 SD-units above the sample mean?
(C) Between 1.50 SD-units below and 1.50 SD-units above the sample mean?
Suppose you were to cut up the directory and pull out one listing at random to contact.
The probability of obtaining a random sample mean, which is lower than the population mean, is:
Explain in words general pattern of correlation is statistically important.
Given sample data arranged in a frequency distribution table. Use Excel to calculate the sample mean and variance from this data set.
Assuming that these are a random sample of all publicly traded companies, construct a 95% confidence interval for the overall noncompliance proportion.
A company has developed the new battery, but the average lifetime is unknown. In order to estimate the average, a sample of 150 batteries is tested and an average lifetime of this sample is found to be 250 hours.
Using standard normal table, show critical value for left-tailed test with α = 0.02.
Utilizing a binominal experiment, that is each trail can be reduced to two outcomes, construct a binomial distribution.
200 people were surveyed and asked to rate mayor Michael Bloombergs effectiveness towards education. The rate scale is 1 (lowest) to 10 (highest). Mayor Bloomberg's average rating was 7.50, with a standard deviation of 2
Suppose that the number of babies born during an hour at a hospital's maternity wing follows a Poisson distribution with a mean of 4 per hour.
On the same chart, produce a graph showing the original probability mass function, and a line graph showing your selected continuous probability density function.
Determine the value of correlation coefficient between these 2 variables?
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