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A researcher is investigating effectiveness of new study-skills training program for elementary school children. Sample of n= 25 third grade children and each child is given standardized achievement test at end of year. For regular population of third grade children, scores on test form normal distribution with mean of µ = 150 and a standard deviation of σ = 25. Mean for sample is M = 158.
a. Draw the suitable distribution, and locate critical regions for α = .05.b. Compute test statistics (z score) for sample.c. What decision must be made about effect of program?
A survey of 100 clients of pacific gas and electric resulted in the following frequency distribution of monthly charges.
What percentage of items will weigh between 6.4 and 8.9 ounces?
We will test to determine if there evidence of an improvement on the final examination, at the 1% significance level. What is the alternate hypothesis?
What are the predictor and response variables? Make a scatterplot of the data and find r to see if a linear pattern seems to exist. If it appears to have a linear relationship, find the regression line. Dont forget to state what r is, and interpret..
A new product has the following profit projections, associated probabilities, and indifference probability:
To investigate this belief, he randomly samples 41 adult women and records their weights. The scores have a mean of 111 lbs. and a standard deviation of 12.4. A local census taken several years ago shows the mean weight of adult women was 115 lbs.
Write introduction to STATISTICAL PROCESS CONTROL and Explain the use of SPC tools used at D2D
In a survey of women in a certain country (ages 20-29), the mean height was 62.9 inches with a standard deviation of 2.81 inches.
FBI Report do greater universities that tend to have more property crime. Keep a scatter diagram also sketch the line you think best fits the data.
A Tamiami shearing machine produced 8 percent defective pieces. The quality control engineer has been checking the output by almost continuous sampling. What is the probability that in a sample of 9 pieces:
Based on these results, a confidence interval for the population mean is found to be μ = 5.7 ± 4.4. Find the degree of confidence.
A partial computer output from a regression analysis as follows. The regression equation is:
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