Stat some formulas which will help in my exam to write and

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some formulas which will help in my exam to write and i want its answer also with nice answers .i want the best answerrs i want question which is very imp.very ood expert answers

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Basic Statistics Questions & Answers

  Form a confidence interval for the difference of proportions

The same survey was mailed to 500 adults aged 25–34 without the gift certificate. There were 65 responses from the first group and 45 from the second group. (a) Perform a two-tailed test comparing the response rates (proportions) at α = .05

  State the value of the test statistic

At the .05 level of significance, is there evidence that that the proportion of delayed Southwest Airlines departures from Phoenix in January 2008 is greater than 25%? State the decision in terms of the problem.

  How many golfers must be surveyed for margin of error

How many golfers must be surveyed if we want % confidence that the sample proportion has a margin of error of 0.025?

  A television ratings analyst estimates that at least 72 of

a television ratings analyst estimates that at least 72 of u.s. adults enjoy science fiction shows. in a random sample

  How blood pressure levels for women differs from men

Use .05 significance level to test the claim that blood pressure levels for women differs from the blood pressure levels of men.

  Drinking behaviors of sophmore men and women

A professor asked her sophomore students, "How many drinks do you typically have per session? (A drink is defined as one 12oz beer, one 4oz glass of wine, or one 1oz shot of liquor.)"

  Find mean and variance of number of ink jet printers

If a group of 10 printers is chosen at random from the store, find the mean and variance of the number of ink jet printers.

  Describe effect of outlier-extreme value-confidence interval

Change the last number from 257 to 61 and recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.

  An interaction effect that is not significant indicates

an interaction effect that is not significant indicates thata. the influence of one factor is not the same for each

  A sample of 10 observations is selected from a normal

a sample of 10 observations is selected from a normal population for which the population standard deviation is known

  Perform a hypothesis test to determine if there is a signify

Perform a hypothesis test to determine if there is a significant correlation (α =0.05) between number of hours of overtime worked and hours of sleep

  Developing a multiple regression model requires judgment

problem 1provide me a 1.5 pages of discussion and answer each question in detail. also label each question with each

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