Find the critical value tc for the confidence level c=0.90 and sample size n=26.
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Find the critical value tc for the confidence level c=0.90
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- Your company produces cell phones and you need to determine the typical time for your phones to recharge. The research department takes a random sample of 50 phones and calculates the sample average time to recharge the phones to be 97 minutes and the sample standard deviations to be 20 minutes. a. Calculate the 95% confidence interval for u, the mean time for a phone to recharge, and interpret it in words. The z-critical value for this interval is za = Zo.os = Zo025 = 1.96. 2 b. Intrepret the confidence interval in words. c. The vice president of research asserts that the mean time to recharge a phone is 90 minutes. Do you agree with this? Explain how you know. d. Suppose your company needs a narrower confidence interval, so it can target marketing strategies more precisely. Calculate the sample size necessary to obtain a confidence interval with width 2 minutes.Use Table B to find the critical value t* that should be used in constructing a 98% confidence interval based on a simple random sample of size n = 29 for the population mean. Assume the conditions are met. options t* = 2.467 t* = 2.326 t* = 2.462 None of these is correct.Please find the two values listed
- Find the critical values x2 and x²R for the given confidence level c and sample size n. c=0.95, n=24 XL=(Round to three decimal places as needed.) XR=(Round to three defimal places as needed.)What critical value of t* should be used for a 95% confidence interval for the population mean based on a random sample of 21 observations? Find the t-table here. t* = 1.721 t* = 1.725 t* = 2.080 t* = 2.086The ages of registered voters in Smith County are normally distributed with a population standard deviation of 3 years and an unknown population mean. A random sample of 18 voters is taken and results in a sample mean of 55 years. Find the margin of error for a 95% confidence interval for the population mean. z0.10z0.10 z0.05z0.05 z0.025z0.025 z0.01z0.01 z0.005z0.005 1.282 1.645 1.960 2.326 2.576 You may use a calculator or the common z values above. Round the final answer to two decimal places.
- The sample mean and standard deviation for weights of 100 boxes are 12.05g and 0.1g respectively. Find a 90% confidence interval for the mean weight of the boxes.Find the critical value t/α2 needed to construct a confidence interval of the given level with the given sample size. Round the answer to at least three decimal places. Level 95%, sample size 9. Critical value =Find the critical value tc for the confidence level c=0.99 and sample size n=19. tc=
- A simple random sample of size 23 has mean x̄ = 1.48 and standard deviation s = 1.32. The population is approximately normally distributed. Construct a 99% confidence interval for the population meanFind the critical value tc for the confidence level c=0.90 and sample size n=13. tc= (Round to the nearest thousandth as neeA random sample of size 16 is taken from a normal distribution with population variance 2.56 and sample mean is 130, find the margin error for 95% confidence interval of population mean a. 1.784 O b. 1.254 O . 0.784 O d. 0.194
