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Z-test, and T-test.
A z-test is used for testing the mean of a population versus a standard, or comparing the means of two populations, with large (n ≥ 30) samples whether you know the population standard deviation or not.
Z-tests can also be helpful when we want to test a hypothesis. Generally, they are most useful when the standard deviation is known.
T-tests are calculations used to test a hypothesis, but they are most useful when we need to determine if there is a statistically significant difference between two independent sample groups
T-tests are most appropriate when dealing with problems with a limited sample size (n < 30).
Consider the following test of whether a coin is fair. Toss the coin five times. If the coin lands either all heads or all tails, reject Ho: p= 1/2. (The p denotes the chance for the coin to land on heads.) Complete parts a and b. (a) What is the pr..
Descriptions, such as, PCR, STR, gene drift, gene pool, describe how plants evolved from seedless to seeds, non vascular to vascular, logistic growth, exponential growth, describe an actual biome. please use apa.
The mean sales per customer µ for all of the sales for your company last month is not known. Based on your past experience, you are willing to assume that the population standard deviation of sales, σ, is about $220. If you take a random sample of 10..
A health researcher conducted an experiment in which participants watched a film that either did or did not include a person being injured because of not wearing a seat belt. A week later, as part of a seemingly different study, these same participan..
According to the Center on Budget and Policy Priorities article "Curbing Flexible Spending Accounts Could Help Pay for Health Care Reform" (revised June 10, 2009), flexible spending accounts encourage the over-consumption of health care; people buy t..
If you ran the regression of GPA on hours watched omitting whichever of the 4 points above you deemed most influential, what do you expect would happen to the slope coefficient
The population mean is within $50.00 of the sample mean?
The Economic Policy Institute reports that the average entry-level wage for male college graduates is $22.82 per hour and for female college graduates is $18.01 per hour. The standard deviation for male graduates is $3.72 and for female graduates is..
A cognitive psychologists knows that concrete words, which easily evoke images (.e.g. "sunset", "truck") are easier to remember than abstract words, but she would like to know if those who frequently use visual imagery differ from those with little v..
Perform a test of hypothesis to determine whether the variances of two populations are equal and describe the ANOVA approach for testing difference in sample means.
The following frequency distribution contains information about urban residents' self-evaluation of the likelihood that they will be a victim of crime in the next year.
1. Find the critical value za/2that corresponds to a degree of confidence of 98%. Select one: a. 2.575 b. 1.75 c. 2.33 d. 2.05
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