Question

1/The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 56.7 for a sample of size 664 and standard deviation 11.2.
Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 95% confidence level).
Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place).
( 65.6742 ) < μμ <(68.3258 ) this is wrong answer

2/Assume that a sample is used to estimate a population mean μμ. Find the margin of error M.E. that corresponds to a sample of size 6 with a mean of 42.5 and a standard deviation of 11.5 at a confidence level of 80%.
Report ME accurate to one decimal place because the sample statistics are presented with this accuracy.
M.E. = ( 1.325823 ) is wrong answer

Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places

Answer should be obtained without any preliminary rounding.

3/You measure 34 turtles' weights, and find they have a mean weight of 67 ounces. Assume the population standard deviation is 4.7 ounces. Based on this, construct a 90% confidence interval for the true population mean turtle weight.
Give your answers as decimals, to two places

(65.67) ±± (68.33) ounces this is wrong answer

Answer 1