X1=45 N1=35 S1=9 X2=47 N2=40 S2=8 Find the confidence interval of 80% ?

Express the confidence interval 66%±3%66%±3% in interval form.

You want to examine the effectiveness of a new tutoring program at SWC. A sample of n=9 stats students is used to evaluate t. Each students grade point average is recorded before the program and after the program. The average GPA improved by Mp=0.60 points with s^2 =0.09. the researcher would like to use the sample to estimate how much effect the workshop would have for the entire college population. Which of the following is the 80% confidence interval for these data? A.    μD=0.60 + 0.10(1.397) B.    μD=0.60 +  0.09(1.860) C.   μD=0.60  +  0.01(1.397) D.    μD =0.60 + 0.10(1.860)

100 students take a test in 2018. The average score was 75 and the standard deviation of the final exams scores was 5. The following year (2019), the professor changed her teaching style, and then taught the class to 90 students, gave the same exam, and found an average score of 80 and a standard deviation of 8.. Compute the 95% confidence interval for the final exam score in ECON 540 for 2018. Interpret the interval.

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

How do you Express the confidence interval (0.839, 0.958) in the form of p±E?

An article claims that babies spend twice as much time in REM (rapid eye movement) sleep than adults. This implies that babies have an average of 6 hours of REM sleep per night. A doctor would like to test the hypotheses = 6 versus  ≠ 6 where  = the true mean amount of REM sleep per night for babies. A 95% confidence interval for the true mean amount of REM sleep per night for babies is (5.45, 6.25) hours. Based on the confidence interval, what conclusion would you make for a test of these hypotheses? The 95% confidence interval  include  as a plausible value, so we  H0. We  convincing evidence that the true mean amount of REM sleep per night for babies  6 hours.

Solve Question 2 Please show work

A random sample of 11 items is drawn from a population whose standard deviation is unknown. The sample mean is x=920 and the sample standard deviation is s=25. Use Appendix D to find the values of student's t

Construct a confidence interval for p1- P2 at the given level of confidence. x1 = 26, n1 = 270, x2 = 38, n2 = 296, 99% confidence The researchers are 1% confident the difference between the two population proportions, p1 - P2, is between and (Use ascending order. Type an integer or decimal rounded to three decimal places as needed.)