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Find the standard deviation and variance from the (population) data below. Describe your results.
Ages of students in a class
18 19 20 21 2318 17 20 24 2019 20 19 20 2118 22 19 18 21
Write Cumulative distribution function.Find the cumulative distribution function F(x).
An SRS of 100 of a certain popular model car in 1993 found that 20 had a certain minor defect in the brakes. An SRS of 400 of this model car in 1994 found that 50 had the minor defect in the brakes. Let p1 and p2 be the proportion of all cars of t..
Does all statistical data have a mean, median, or mode? Why? When is the mean the best measure of central tendency? When is the median the best measure of central tendency?
If probability of drawing a face card is 0.625. Determine the probability of not drawing a face card.
What is the probability of drawing one or more aces after discarding 5, 7, 8, and 9
When would you use hypothesis testing and when would you use confidence intervals?
Use the normal distribution to approximate the following probability: According to the most recent Davenport student profile, 47% of students have children under 17 living at home with them.
If gambler rolls two dice and gets sum of four, he wins $10; and if he gets sum of three, he wins $25. Cost to play game is $5. What is expectation of this game?
Determine whether the evidence is enough to reject the salesperson's claim. Establish the Null and alternative hypothesis, and choose the right test statistics.
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
Estimate the area under the Normal Distribution from the mean to a z-score of -2.07. Estimate the z-score that corresponds to an area of 0.5557 under the Normal Distribution.
Utilizing Excel data analysis calculate t distribution also deduce the result. Study of variance is used to investigate if there is a difference in the mean mileage of the three cars.
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