Use The t Distribution Table to find the t/α2 value for a 90% confidence interval for the mean when the sample size is 8. t/a2 =
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Use The t Distribution Table to find the t/α2 value for a 90% confidence interval for the
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- Construct a 99% confidence interval for H1 H2 with the sample statistics for mean cholesterol content of a hamburger from two fast food chains and confidence interval construction formula below. Assume the populations are approximately normal with unequal variances. Stats x₁ = 135 mg, s₁ = 3.82 mg, n₁ = 18 Confidence interval when (x-2)- variances are not equal 2 AJustin is interested in buying a digital phone. He visited 15 stores at random and recorded the price of the particular phone he wants. The sample of prices had a mean of 280.2 and a standard deviation of 22.92. (a) What t-score should be used for a 95% confidence interval for the mean, μ�, of the distribution?t* = (b) Calculate a 95% confidence interval for the mean price of this model of digital phone:(Enter the smaller value in the left answer box.)Determine the value of t necessary to X construct a confidence interval when the sample size is 5 and the level confidence is 99.9%.Construct a 90% confidence interval for u, -la with the sample statistics for mean chalesterol content of a hamburger from two fast food chains and confidence interval construction formula below Assume the populations are approximately normal with unequal variances Stats X =71 mg. s, = 3.99 mg. n = 15 X2 = 59 mg. s2= 2.16 mg na Confidence interval when variances are not equal df is the smaller of n1 or n, - 1 Enter the andpoints of the intanial I Round to the nearest intoger as needed )Find the critical value to for the confidence level c = 0.95 and sample size n = 18. tc = Click the icon to view the t-distribution table. ... (Round to the nearest thousandth as needed.)We want to estimate the mean number of pages per book in the fiction section of the large school library at a 99% confidence level. A sample of 35 fiction books is randomly selected, and the mean number of pages is calculated to be 291.8 pages per book with a standard deviation of 47.6 pages per book. Use the table to find the appropriate value of t* to use in the given scenario. Enter in the value of t* exactly as you see it written in the table. 1.684 1.697 2.704 2.750A simple random sample of IQ scores is selected from a normally distributed population of statistics professors. The sample statistics are n=17,x=126, s=12. Determine the critical value of t and the margin of error, and then construct the 95% confidence interval estimate for the population mean.Find the Critical Values of the t- Distribution needed for a 95% confidence interval for the mean, with df=6. (that is find txα/2). Just type in the positive value, to 3 decimal places, in the text box below.Find the critical value t for the confidence level c=0.95 and sample sizen=24. Click the icon to view the t-distribution table. (Round to the nearest thousandth as needed.)Age Differences In a large hospital, a nursing director selected a random sample of 43 registered nurses and found that the mean of their ages was 31.5. The population standard deviation for the ages is 4.5. She selected a random sample of 32 nursing assistants and found the mean of their ages was 29.7. The population standard deviation of the ages for the assistants is 5.3. Find the 95% confidence interval of the differences in the ages. Use μ1 for the mean age of the nursing assistants. Round the answers to at least one decimal place. Use a TI-83 Plus/TI-84 Plus calculator. ? < μ1- μ2 < ?Babies: A sample of 25 one-year-old girls had a mean weight of 24.1 pounds with a standard deviation of 4.3 pounds. Assume that the population of weights is normally distributed. A pediatrician claims that the standard deviation of the weights of one-year-old girls is greater than 7 pounds. Do the data provide convincing evidence that the pediatrician's claim is true? Use the =α0.05 level of significance.A researcher collected sample data for 10middle-aged women. The sample had a mean serum cholesterol level (measured in milligrams per one hundred milliliters) of 192.5, with a standard deviation of 9. Assuming that serum cholesterol levels for middle-aged women are normally distributed, find a 95% confidence interval for the mean serum cholesterol level of all women in this age group. Give the lower limit and upper limit of the 95% confidence interval.Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. Lower Limit___ Upper Limit___SEE MORE QUESTIONS
