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1 .suppose that family incomes in a town or normally distributed with a meeting of $1,120 and a standard Deviation of $ 600 per month .What is the probability that a given family has an income over $ 2000 per month ?2 . During the last week of the semester , students at a certain college spends on the average 4.2 hours using the school's computer terminals with a standard deviation of 1.8 hours .for a random sampling of 36 students at that collage , find the average time spent using the compute terminal during the last week of the semester a, at least 4.8 hoursB ; between 4.1 and 4.5 hours
A sample of 36 packages reveals the mean weight to be 3.01 pounds, with a standard deviation of 0.03 pounds. What is the estimated population mean?
We say that two things have a positive relationship if they move in the same direction, or as one thing increases, so does the other. Or if one thing decreases, so does the other.
A sample size n=100 is taken from a population that has a proportion p= 1/5. If, in the sample, ^p=0.25, will the 95% confidence interval for p contain the true value of p^is at top p at bottom ^p
Random sample of 100 people yielded following data on number of tissues utilized in a cold: x-bar = 38, s = 20. By using sample information provided, compute the value of test statistic for the relevant hypothesis test.
In this group four were African American, 6 were hispanic, and one was Asian. Was this a good sample on which to norm this test? why or why not? What are your suggestions?
We have no idea Regarding the shape of the population distribution. What is the probability that the mean fee for a sample of 30 customers was less than $125?
Suppose that you wish to perform a nonparametric test for a difference among the medians of three or more independent populations. Which of these tests would be appropriate?
At the 0.01 significance level, can we conclude that the mean number of patients per day is more than 25? Estimate the p-value and interpret it.
Two teams of workers assemble automobile engines at a manufacturing plant. Quality control personnel inspect a random sample of the teams assemblies and judge each assembly to be acceptable or unacceptable.
Show that if Z1 and Z2 are independent standard normal random variables, then for all ρ (correlation), Z 1 and ρZ 1 +sqrt(1-ρ 2 )*Z 2 are standard normal with correlation ρ.
They are thinking of introducing a new flavour, maple-marshmallow Frumpies, and want to know whether children will prefer the new flavour to the old one. Design a completely randomized experiment to investigate this question.
The comparison distribution at which the null hypothesis should be rejected, (b) the Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
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