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Q1) Following is a sample of 25 measurements:
10
8
7
5
9
12
6
11
a) Create a dot diagram (plot) of these data
b) Calculate xBAR , s2 and s for this sample.
c) Count number of measurements in intervals. Express each count as percentage of total number of measurements.
d) Compare the percentage found in b) to percentage given by Empirical Rule and Chebyshev's Rule. (Make a table 3 x 3).
Using goodness-of-fit test and.01 level of significance, find out whether accidents are evenly distributed all through the day. Write a short description of your conclusion.
Calculate probability that the sample would have a mean:
The Federal minimum wage is $7.25 (effective July 2009). If an employee earns the new minimum wage, how many complaints can that employee expect to receive?
Test the hypothesis that there is no difference in the mean scores of Exam 1 and Exam 2 against the alternative that the average is greater for the second exam.
If you did not know anything about standard deviation of population from which sample was taken, find out the 95% confidence interval for mean test score.
Assume your statistics professor reports test grades as z-scores, and you got a score of 2.20 on the midterm exam. Write down a sentence explaining what that means.
Use the list of random digits below to assign 4 men and 2 women to the shark fin treatment. Read the table from left to right, first selecting the 4 men and then the 2 women. Use the numerical labels given in the chart to the names.
An educational study uses a simple pre-post design to assess the efficacy of a computer tutor for solving inequalities. Twelve pilot students participate. Each student is given a pre-test, then participates in six sessions using the tutor, then i..
If one person is selected at random, what is the probability that person is Female?
A random variable has the density curve as in the graph below. Find The height of the density curve?
The population of lengths of aluminium-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.2 inches.
If a card is drawn at random from a standard 52-card deck, what is the probability that the card drawn is one of the following?
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