Study guides, Class notes & Summaries

QUESTIONS AND ANSWERS

Refer to the accompanying data display that results from a sample of airport data speeds in Mbps. Complete parts (a) through (c) below. TInterval (13.046,22.15) x=17.598 Sx=16. n=50 a.Express the confidence interval in the format that uses the "less than" symbol. Given that the original listed data use one decimal place, round the confidence interval limits accordingly. b.Identify the best point estimate of μ and the margin of error. c. In constructing the confidence interval es...

Stats Exam #3 8,9,10 With 100% Correct Answers 2023

Suppose that someone sampled 100 Palm trees of the same species, all planted at the same time. They recorded the height for each tree. What shape would you expect the histogram of this data to be? A. Symmetric B. Right Skewed C. Left Skewed D. Uniform - Answer- A. (Symmetric) A marketing researcher is testing out new names for a hair product. She asks 40 women to pick the name of the product that they would be most likely to buy out of a list of 4 names. Could she use a dotplot to descr...

Which of the following is a good point estimator for the population variance? Statistical inference uses statistics calculated from samples as the basis of an inference about the population. If the sample is representative, then the sample statistics (which are random variables that depend on which random sample is selected) ought to be close to their population counterparts. In other words, the sample mean ought to be close to the population mean, the sample proportion ought to be close to the...

Identify the concept explained by the following sentences sampling variability sampling distribution the values of statistics vary from sample to sample there is a recognizable long-term pattern to the variation between samples As the sample size increases, the standard deviation of increases decreases decreases The Central Limit says that when the sample size is at least ________ individuals, the sampling distribution of x ¯ will be normal regardless of the shape of the population di...

Stats Exam 2 Questions & Answers 2023/2024 The sampling distribution of a statistic is a probability distribution for all of the possible values of a sample statistic that can be derived from samples of a given size. - ANSWER-true The standard error of the mean is equal to the standard deviation of the population divided by the _______________________. - ANSWER-square root of the sample size If we select two balls, with replacement, from a box containing two balls, numbered 1 and 0, a...

Stats Final Exam - True and False 2023/2024

Stats Exam 2 Questions & Answers 2023/2024 What is the random variable of the sampling distribution of x̄? - ANSWER-The sample mean Which one of the following is NOT a parameter? - ANSWER-the proportion in a sample survey that favor a certain opinion. Fill in the blank: Central Limit Theorem allows us to compute probabilities on ___________ using the standard Normal table provided the sample size of the random sample is sufficiently large. - ANSWER-x-bar The sampling distribution ...

STATS EXAM 1 - FINAL REVIEW QUESTIONS & ANSWERS 2023/2024 For a one-sample t-test, all of the following will increase the magnitude of the t statistic, and therefore the likelihood of rejecting the null hypotheses, except - ANSWER-An increase in sample variance The paired t-test assumes data are - ANSWER-Sampled (necessarily independently) from a normally Distributed population If we have run a one-sample t-test with N=1,035 observations and we have calculated a t-value of 8.57, which...