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Q1) Class takes the exam where average time to finish the exam is normally distributed with a 40 minutes and standard deviation of 9 minutes. If class lasts 1 hour, what percent of students will have turned in exam after 60 minutes?
Q2) Following values represent population of home mortgage interest rates (in percents) being charged by banks in particular city:
6.9
7.5
6.5
7
7.3
6.8
7.2
7.8
6
Given this information, what would sampling error be if sample including seven values in top row were used to calculate sample mean?
a) Approximately 6.93
b) Out 0.56
c) Approximately -0.07
d) About 0.07
Determine the shape of chi-square distribution?
What is the probability that none can transact business in a foreign language?
The mean amount of time a (unnamed) computer server is down is 18.3 minutes with a standard deviation of 5.7 minutes.
Prepare an ANOVA table and test the null hypothesis of no linear relationship between the two variables.
Assume that the length X in minutes of a regular season NBA game is normally Distributed with X~N (µ X , σ 2 X );
The width of a confidence interval will be:
Give all steps of a test of the hypothesis that the corresponding population proportions are equal.
To find out the proportion of the population of likely voters who agree the statement. Could we say among appropriate statistical certainty which the proportion of the population of likely voters.
A normal distribution with a mean of 55 and a standard deviation of 6 is evaluated to solve a business problem.
Re item 4, assume the critical value for this test is 4.92, and you obtain a computed statistical value of 7.45. Is there evidence to refuse null hypothesis? Describe why or why not?
Cores on two tests have a bivariate normal distribution; and that correlation of 2 scores is 0.8. Determine the probability that sum of the student's scores on 2 tests will be greater than 200?
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group, (a) Make a bar chart and describe it. (b) Calculate expected frequencies for each class.
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