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Q1) A year ago, Air Force implemented new test for finding which candidates are most probable to become successful pilots. Now they wish to see if implementing pilot predictor test was a good idea. Scores have been standardized to facilitate comparison.
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Performance Score (X)
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a) Determine the null hypothesis?
b) Compute the value of test statistic?
c) Are results statistically significant? Explain why or why not?
d) What conclusions can you draw from your findings?
Make up a scatter diagram with 10 dots for each of the following situations:
Sample data recently collected indicate that Dough Boy's crusts average 30 centimeter in diameter, with a standard deviation of 1.1 centimeters.
At the 5% significance level, if the sample proportion is .45, and the standard error of the sample proportion is .035, the appropriate conclusion would be:
Assume that the number of left-handers is a binomial random variable. (Refer to the formula for mean and standard deviation for binomial prob. Distribution)
Probability histogran curve of percentage of (P)z
Some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and soil treatment. An experiment was conducted to compare peach tree seedling growth with soil and weeds treated with one of two her..
Which of the following assumptions for inference about a proportion using a confidence interval are violated,
A school tracks the absences of pupils as part of a flu surveillance system. Regular reporting of absences among 25 students in grade 1 are taken, and based on these data, the long-run proportion of absences under normal conditions is estimated to..
A random sample of 15 paired observations has a correlation of -.46. Can we conclude that the correlation in the population is less than zero? Use the .05 significance level.
Research question: Are mean crash damages same for these 3 vehicles? Crash1 Crash Damage ($).
Which is the probability that the median of the sample is between $17 and $20?
Based on this information, confidence level would be 90% that population mean is somewhere between?
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