Consider a right tailed test with a = 0.15. What is the rejection region for this one-sided confidence bound at the 85% confidence level? (a) Z> 1.036 (b) Z < 1.356 (c) Z < 2.12 (d) Z> 1.96 (e) None of the above
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Confidence level = 85%
The test is right tailed.
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- 2) (9.2) Suppose a random sample of 1001 Americans age 15 or older were asked "How much time do you spend eating or drinking per day?" Of the 1001 participants, the mean amount of time spent eating or drinking per day is 1.22 hours with a standard deviation of 0.65 hours. Determine a 99% confidence interval for the mean amount of time Americans age 15 or older spend eating or drinking each day.The patient's recovery time from a particular surgical procedure is normally distributed with a mean of 26 days and a standard deviation of 7.24 days. Let X - is the number of days a randomly selected patient needs to recover from the surgical procedure. What is the upper bound of 90% confidence interval of X?"A company produces resistors by the thousands, and Gerry is in charge of quality control. He picks 26 resistors at random as a sample, and calculates the sample mean x = 7.268 kOhms and sample standard deviation S = 0.2142 kOhms. Calculate the confidence interval as a (+/-) value to 65% confidence level."
- At sig level of 0.05, the upper limit for a confidence interval is lower than the true unknown mean of a population when the sample mean is -__and the probability of this is O Lower than µ+2*SE, 0.975 Between p-2×SE and p+2*SE, 0.95 O Lower than µ-2*SE, 0.025 O Lower than µ-2*SE, 0.05 O Lower than µ+2*SE, 0.95A quality control expert at a pretzel factory took a random sample of 10 bags from a production run of over 500 bags and measured the amount of pretzels in each bag in the sample. The sample data were roughly symmetric with a mean of 450 g and a standard deviation of 15 g. Based on this sample, construct a 99% confidence interval for the mean amount of pretzels per bag (in grams) in this production run? Based on this sample, construct a 98% confidence interval for the mean amount of pretzels per bag (in grams) in this production run?Can you solve this problem about the confidence interval?
- A 98% confidence intervals for the proportion of first-year statistics students with brown hair is given to be (0.28, 0.42).(d) What is the standard error of the estimate?(Round to 3 decimal places, if needed.)(e) What was the sample size?(Round to the appropriate integer.)A random sample of 250 SCC students yields 79 full-timers and 171 part-timers. (a)Construct a 90% confidence interval for the overall proportion of full-time students at SCC.(b)The margin of error associated with the above c.i. is_____(c)How large a sample should be selected if we want the margin of error to be 2 percentage points?A sample of size n=79 Is drawn from a population whose standard deviation is o = 29, Part 1 of 2 (a) Find the margin of error for a 90% confidence interval for l. Round the answer to at least three decimal places. The margin of error for a 90% confidence interval for u is Part 2 of 2 (b) If the sample size weren=44, would the margin of error be larger or smaller? (Choose one) ▼ because the sample size is (Choose one) Larger Smaller
- A 95% confidence intervals for the proportion of first-year statistics students with brown hair is given to be (0.29, 0.45). (a) What is the sample proportion of students with brown hair? (Round to 3 decimal places, if needed.) (b) What is the margin of error of this interval? (Round to 3 decimal places, if needed.) (c) What is the critical value used for this interval? (Round to 3 decimal places, if needed.) (d) What is the standard error of the estimate? (Round to 3 decimal places, if needed.) (e) What was the sample size? (Round to the appropriate integer.)A sample of 100 students was taken from the introductory statistics classes. This group averaged 74.5 on the final exam with a sample standard deviation of 3.2. Assuming that this group is a random sample of all students who have taken statistics and the scores in the final exam for all students are approximately normally distributed, what is the approximately 95% confidence interval for the true population mean of all statistics students?Suppose that medical science has a cancer-diagnostic test that is 95% accurate on both those who do and those who do not have cancer. If 0.005 of the population actually has cancer, compute the probability that a particular individual has cancer, given that the test detected cancer.
