the sampling distributions

Which of the following statements is/are true? I. The sampling distribution is a theoretical distribution of a sample statistic. II. Sampling distribution is same for each sample statistic. III. A sample distributi..

Which of the following is a property of sampling distribution? I. Mean of sampling distribution equals population mean. II. Sample mean comes closer to population mean than any other unbiased mean. III. As sample size increases, variation ..

A population consists of the five numbers 1, 3, 5, 7 and 9. Consider all the samples of size 2 that can be drawn without replacement from the population. Find the mean and the variance of the sampling distribution means. => 6 and 4.05 or 6 and 3 or 5 and 3.05 or 5 and ..

What formula is used to gain information about a sample mean when the variable is normally distributed or when the sample size is 30 or more? => z = X - μ σ or z = X ‾ - μ σ n or z = X ‾ - μ σ n or z = X - μ σ..

Compute the sampling distribution for two tosses of an unfair coin, where probability of a coin landing heads-up is 0.25; X = 1 represents for heads, and X = 0 represents for tails. => Figure 1 or Figure 3 or Figure 4 or Figure 2..

An unfair coin has a 60% chance of landing heads-up. If X = 1 represents a coin landing heads-up, and X = 0 represents a coin landing tails-up, then find the sampling distribution of the mean( x ‾ ) for samples of size 3. => Figure 4 or Figure 2 or Figure 1 or ..

A pharmaceutical company distributed 12000 trial samples of an acne relief cream to middle school students. How many middle class students were there in the school, if each student received 4 samples? => 3100 or 3000 or 2700 or 3200..

The standard deviation of the sampling distribution (σ x ‾ ) for a sample of n is 8.57, when the standard deviation of the target population is 21. Find the sample size. => 36 or 3 or 6 or 12..

Choose the incorrect statement(s). I. A statistic is a numeric descriptive measure of a population. II. The sampling error is the difference between the population value of interest and sample value. III. If the sample is randomly selected from the population, then ..

A random sample of 81 students was tested for the problem solving approach skills. The variance of the scores obtained from the sample was found to be 144. Find the 80% confidence interval for the variance and standard deviation. Assume that the variable is normally distrib..