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People in a large population average 60 inches tall. You will take a random sample and will be given a dollar for each person in your sample who is over 65 inches tall. For example if you sample 100 people and 20 turn out to be over 65 inches tall, you get $20. Which is better: a sample of size 100 or a sample of size of 1,000? Choose one and explain. Does the law of average relate to the answer you give?
In a random sample of 225 students at a university, 180 stated that they were nonsmokers. Based on this sample, compute a 95% confidence interval for the proportion of all students at the university who are nonsmokers.
Iif the sample consits of 16 scores, is the sample mean sufficient to conclude that the treatment has a significant effect? use a two tailed test with .05.
Now compute the standard deviation for this distribution.
Which is the estimated or dear proportion of defective cups in the population?
Precisely (i.e., using specific numbers) what does central limit theorem tell us about sampling distribution of sample means for samples of this size from this population?
This sample has a mean weight of 5.03 Kg and a standard deviation of 0.21 Kg. Can we calculate that the mean weight produced by the machine has increased? Use 5% level of significance.
What is the probability that a simple random sample of automobile insurance polocies will have a sample mean within 25.
If X and Y are two independent Poisson random variables, then show that the conditional distribution of X given X+Y is binomial.
Is it reasonable to compute that the mean of the population is actually $15,000.
Build regression models for predicting house prices. We will be using data collected on 91 houses in Gainesville, Florida. The dataset contains the selling price of each house and information on four other explanatory variables.
They then call these 100 people. Does this sampling plan result in a random sample? Simple random sample? Explain.
At the 0.10 significance level, can we conclude that the annual rates of return are higher on the big board?
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