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The results of a district spelling bee for both girls and boys are normally distributed. the 60 girls have a mean score of 71 with a standard deviation of 6, while the 50 boys have a mean score of 66 points with standard deviation of 5 points. Those students with a score greater than 75 are eligible to go to the state spelling bee contest. How many girls are going to the state contest?
Locate the results of a recent survey in a newspaper, magazine, or Internet article. Outline the survey data so that your peers can understand the variables and results, and then identify at least one key formula from this Module that you could us..
Develop a probability distribution for the number of students in the sample who watch soap operas.
Could this information be viewed as representing the ratio scale of measurement? If so , explain why. If not, why not.
Why then does it matter whether we assume straight-line or MACRS depreciation when we assess project NPV?
What is the probability that separates the bottom 25 percent from the rest of the distribution.
You read that statistical test at α=0.01 level has probability 0.14 of making a Type II error when specific alternative is true. Calculate the power of test against this alternative?
The lifetime (hours) of an electronic device is a random variable with the exponential probability density function:
Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major.
Confidence interval for the true mean and Evaluate the 95% confidence interval for the true mean advertising expense?
If all samples of size 64 are drawn, mean of sample according to Central Limit Theorem is 100.
Suppose the probability of a boy being born is the same as the probability of a girl being born. Find the probability that a family with three children will have two boys and one girl.
What is the population from which your sample has been taken? Description of data taken from other sources. Preliminary analysis using histograms, box plots, scatter plots, etc. and investigation of outliers. Do you keep or discard identified outl..
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