The standard deviation of test scores on a certain achievement test is 11.5. A random sample of so scores on this test had a mean of 72.5. Based on this sample, find a 99% confidence interval for the true mean of all Scores. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit: O Upper limit: 0

Out of 400 people sampled, 60 had kids. Based on this, construct a 90% confidence interval for the true population proportion of people with kids.Give your answers as decimals, to three places.______ < p < __________

We have a population of frogs with a mean weight of 0.9 pounds. We select four frogs and find their average weight. What do you suppose it will be?

A sample of 30 commuters in the area of a certain city yielded the accompanying commute times, in minutes. Preliminary data analyses indicate that the t-interval procedu interval for the mean commute time of all commuters in the area of the city. (Note: x= 27.47 minutes and s 9.81 minutes.) Click here to view the commute times. Click here to view page 1 of the t-table. Click here to view page 2 of the t-table. an reasonably be applied. Find and interpret a 99% confidence ..... The 99% confidence interval is from minute(s) to minute(s). (Round to one decimal place as needed.) Commute times 22 28 33 26 42 29 27 36 25 14 47 39 32 15 18 11 21 17 30 26 15 21 28 17 29 46 18 36 36 40 Print Done Clear all Check answer View an example Get more help - Help me solve this NOV W 3,769 étv 23 280 MacBook Air DII F11 F12 吕口 888 F10 • F7 F8 F9 F5 F6 F4 esc F2 F3 F1 & %23 %24 dele 7 8 9- 2 4. E R Y. 会 w/

Alpha is usually set at .05 but it does not have to be; this is the decision of the statistician. Alpha is usually set at .05 but it does not have to be; this is the decision of the statistician. True False

If n=25, ¯xx¯(x-bar)=47, and s=3, find the margin of error at a 80% confidence levelGive your answer to two decimal places. ________________

Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. A single thermometer is randomly selected and tested. Find P70, the 70-percentile. This is the temperature reading separating the bottom 70% from the top 30%.P70 = °C(Round answer to three decimal places)