Need help solving this. Thanks! Exam 2 BA 240 Problem 2: 1: W. Li Circle the cor

Question

Need help solving this. Thanks! Exam 2 BA 240 Problem 2: 1: W. Li Circle the correct answer. (1 point each) Suppose a 95% confidence interval for the population mean turns out to be (1000, 2100). If this interval was based on a sample of size of n 22, explain what assumption is necessary for th be valid The sampling distribution must be biased with 21 degrees of freedom B) A) The sampling distribution of the sample mean must have a normal distribution. C) The population must have an approximate t distribution. D) The population must have an approximately normal distribution. 2: Suppose you are studying different attributes of several breeds of dogs. You are interested in estimating the mean shoulder height of Labrador retrievers. What is the target parameter? A) F 8) u c) ? D) p E) p 3: Forty-five CEOs from the electronics industry were randomly sampled and a 99% confidence interval for the average salary of all electronics CEOs was constructed. The interval was ($101,866, $115,016). To make more useful inferences from the data, it is desired to increase the width of the confidence interval. what two ways will result in an increased interval width? Sample Size and Confidence Level A) Increase, Increase B) Increase, Decrease C) Decrease, Decrease D) Decrease, Increase 4: A hypothesis test is used to prevent a machine from underfilling or overfilling quart bottles of beer. On the basis of sample, the null hypothesis is rejected and the machine is shut down for inspection. A thorough examination reveals there is nothing wrong with the filling machine. From a statistics point of view: A) Both Type l and Type II errors were made. C) A Type I error was made. B) A correct decision was made. D) A Type Il error was made. E) None of above 5: The Central Lim it Theorem says the sampling distribution of the sample mean is approximately normal under certain conditions. What is a necessary condition for the C.L.T.to be used? A) The population from which we are sampling must be normally distributed. B) The population from which we are sampling must not be normally distributed. C) The population size must be large (e.g. at least 30). D) The sample size must be large (e-g. at least 30). attarh yout 2 sheets of cheat sheet at the BACK of the exam, and Staple together.

Explanation / Answer

1) option D is correct

2)

option B is correct

3)

by decreasing the sample size increase the margin of error as well increasing confidence level increase margin f error

option D

4)

option C is correct (as null hypothesis was rejected when it was true)

5)

option D is correct

Related Questions

Navigate

• Browse (All)
• Browse N
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.