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If the researcher computes the t-statistic to be 4.2 and t-value found in t table for df=60 and level of significance of 0.5, is 2.0 researcher would accept or reject null hypothesis or conclude that the error in computations was made or use different level of significance?
In testing the difference between two means from two independent populations, the sample sizes do not have to be equal to be able to use the Z statistic.
Find out the probability that: First electric brush chosen is defective?
Find out the mean number of letters that will arrive in two days.
You sample a group of computers and use the sample statistics to calculate a 95% confidence interval of (-10.95, -1.5). This interval estimates the difference of (average boot time (HDD) - average boot time (SSD)). What can we conclude from this i..
Without using formulas, explain the meaning of (a) expected value of a random variable; (b) actuarial fairness; and (c) variance of a random variable.
Average electric use was studied.a previously known population standard deviation was 450KWH. a sample of 81 houses was studied and found to have a mean of 1858 KWH. Find the 95% confidence interval for the true mean.
Visits to Web sites. What kinds of Web sites do males aged 18 to 34 visit most often? Pornographic sites take first place, but about 50 percent of male Internet users in this age group visit an auction site such as eBay at least once a month. Inte..
An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Find the 99% confidence interval for µ, the average annual salary ..
Tay-Sachs couples. Approximately 1 in 28 people of Ashkenazi Jewish descent are Tay-Sachs carriers. In randomly sampling one man and one woman from this population, what is the probability neither is a Tay-Sachs carrier?
Use the binomial distribution to determine the probability that a student will get at least 8 out of 10 questions on a ten question multiple choice test correct by just guessing if each question has four
Absolutely lost on how to determine what is being asked in below problem. Need to calculate the covariance and correlation between X and Y
A real estate builder wishes to determine how house size (house) is influenced by family income (income), family size (Size) and education of the head of household (School).
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