Construct the confidence interval for the population mean μ   c=0.90 x=7.2, σ=0.6 , n=44 A 90% confidence interval for μ is ?

A simple random sample of 10 subjects finds that the sample mean is 56 and the standard deviation is 4. Find the 98% confidence interval for u. Display the result in interval notation. You must round your result to decimal places. Remember that the information you have is from a small sample, you must use the t distribution. Remember that critical values ​​can be calculated in EXCEL using the degrees of freedom (n-1) and the level of significance (I - C) as a function of T.INV 2T (Level of Significance, Degrees of Freedom) Select one: a. The interval is: (53,057, 58,943) b. The range is: (53,521, 58,479). c. The interval is: (51,080, 60,920) d. The interval is: (51.991, 60.009) e. The interval is: (52,431, 59,569)

A 95% two-sided confidence interval for μ which has been calculated using R turns out to be (0, 1). A 90% two-sided confidence interval based on the same data will contain the value 0.9 (True, cannot tell, or False)

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 < ?

A 99% confidence interval (in inches) for the mean height of a population is 65.7 < μ < 67.3. This result is based on a sample of size 144. Construct the 95% confidence interval.

To evaluate the effect of a treatment, a sample is obtained and a treatment is administered to the individuals in the sample. After treatment, the sample mean is found to be X = 14.8 with a standard deviation of a = 4.1. Construct a 95% confidence interval for μ, the population mean for the treatment group, assuming the sample contains: (a) N = 15 individuals. (b) N = 30 individuals. (c) Comparing your answers for parts (a) and (b), how does the size of the sample influence the width of your confidence interval for µ?

Assume that a sample is used to estimate a population mean μμ. Find the 95% confidence interval for a sample of size 63 with a mean of 49.8 and a standard deviation of 5.5. Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places.

find out the confidence interval for population proportion  for given data  [ 4 decimal places ] population standard deviation =4 xbar = 123.5 sample size= 100 c= 0.95

Sample Size: We have established that the body weights of 20-29 year old U.S. males are σ=40 pounds. How many observation do we need in order to estimate mean body weight µ with 95% confidence and a margin of error of ± 10 pounds?

You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 20. Find the critical value that corresponds to a confidence level of 80%. (Report answer accurate to three decimal places with appropriate rounding.) ta/2 =