What conditions are required for a valid test for σ2? Choose all that apply. -The population...
What conditions are required for a valid test for σ2? Choose all that apply.
-The population from which the sample is selected has a distribution that is approximately normal.
-The sample is random, but not necessarily from the target population.
-The population from which the sample is selected follows a chi-square distribution.
-A random sample is selected from the target population.
Homework Answers
Ans:
Correct options are:
The population from which the sample is selected has a distribution that is approximately normal.
A random sample is selected from the target population.
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What conditions are required for a valid test for σ2?
Choose all that apply.
-The population...
What conditions must be met to apply a chi-square test for independence on the Friendship Gender...
What conditions must be met to apply a chi-square test for independence on the Friendship Gender data set? O Observed counts are from appropriately selected random samples and the difference between observed and expected counts is approximately normally distributed. Observed counts are from appropriately selected random samples and the sample size is at least 30 for application of the central limit theorem. Observed counts are from i appropriately selected random samples and the population distribution is normally distributed Observed counts...
A one-sample z-test for a population proportion p will be conducted. Which of the following conditions...
A one-sample z-test for a population proportion p will be conducted. Which of the following conditions checks that the sampling distribution of the sample proportion is approximately normal? The sample is selected at random. np0≥10 and n(1−p0)≥10 for sample size n. The sample size is less than or equal to 10 percent of the population size. I only A II only B III only C I and II only D I, II, and III
What distribution is used to calculate the p-value in the one-sample Chi-square-test for the variance? (choose...
What distribution is used to calculate the p-value in the one-sample Chi-square-test for the variance? (choose one answer) Chi-square distribution t-distribution Standard normal distribution F-distribution Binomial distribution
I know that the sum of square of normal random variables follow a chi-square distribution. But...
I know that the sum of square of normal random variables follow a chi-square distribution. But when I learn how to do a goodness-fit test I don't know why the ratio of (O-E)^2/E follows a chi-square. I tried to square root of it first so that I might get something looks like a normal, but my new question arises : why (O-E)/sqrt(E) follows a normal-distribution? I know from sampling distribution that if the sample is from the same distribution as...
1. Why do we need different formulas to calculate test statistics and obtain p-values? Select all...
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Choose the incorrect statement(s). (Check all that apply) A distribution of sample means may not be...
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Let x = age in years of a rural Quebec woman at the time of her first marriage. In the year 1941, the population variance of x was approximately σ2 = 5.1. Suppose a recent study of age at first marria...
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When Chi-square distribution is used as a test of independence, the number of degrees of freedom...
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A random sample of size 39 is to be selected from a population that has a...
A random sample of size 39 is to be selected from a population that has a mean μ = 53 and a standard deviation σ of 15. (a) This sample of 39 has a mean value of x, which belongs to a sampling distribution. Find the shape of this sampling distribution. -skewed right -approximately normal -skewed left -chi-square (b) Find the mean of this sampling distribution. (Give your answer correct to nearest whole number.) (c) Find the standard error of...
What conditions must be met to apply a chi-square test for independence on the Friendship Gender data set? O Observed counts are from appropriately selected random samples and the difference between observed and expected counts is approximately normally distributed. Observed counts are from appropriately selected random samples and the sample size is at least 30 for application of the central limit theorem. Observed counts are from i appropriately selected random samples and the population distribution is normally distributed Observed counts...
1. Why do we need different formulas to calculate test statistics and obtain p-values? Select all that apply. V The choice of test statistic depends on whether data is randomly sampled or not; this determines the sampling distribution. The choice of test statistic is arbitrary, choose whichever seems easiest to use at the time. The choice of test statistic is up to the statistician. We can choose any of the given test statistics to test any of the hypotheses so...
Choose the incorrect statement(s). (Check all that apply) A distribution of sample means may not be normally distributed. D A sampling distribution always has a bigger standard deviation than that of it's corresponding population sample means are approximately normally distributed when n 30. The standard deviation of a sampling distribution of means is the standard deviation of the or ginal population divided by n (the sample size).
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