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Household income does not tend to follow a normal distribution in a particular state, yet average income is approximately $45,000/year in this state, with a standard deviation of about $9000. At least what percentage of household incomes in this state is likely to be between $18,000 to $72,000/year? Show your work as to how this is obtained.
Verify value of t for the independent Variable, using formula. (That is, using formula in the Formula Sheet compute the t statistic , given data provided in the print out).
A company's net sales is $ million from 1993-2002, determine the least squares equation and based on this info, what are the estimated sales for 2005?
Also, assume that X = number among 20 randomly selected coffee purchasers who select a national brand, and that the random variable X follows the binomial distribution.a. What is the probably that at most 15 customers choose a national brand?
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?
At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations.
The Statistical Abstract of the United States published by the US Census Bureau reports that the average annual consumption of fresh fruit per person is 99.9 pounds.
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
Sampling distributions. Given a normal distribution with μ = 50 and standard deviation σ = 9, if a sample of n = 100 is selected.
Computing relative frequencies in a contingency table and a survey of a sample of 347 people is conducted. The survey's respondents are classified according to their political affiliation and their opinion on a bill.
If an apartment is selected at random, what is the probability that it is not a 2 bedroom apartment on the 2nd floor?
Previous studies have indicated the standard deviation of annual earnings for college students is $850. How large a sample would need to be taken to estimate the mean for college students' annual earnings to within $200 with 99% confidence?
The chi-square goodness of fit test can be used when we:
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