Question

1) You measure 48 dogs' weights, and find they have a mean weight of 54 ounces. Assume the population standard deviation is 12.9 ounces. Based on this, construct a 90% confidence interval for the true population mean dog weight.

Give your answers as decimals, to two places

_______ ± _______ ounces

2) Assume that a sample is used to estimate a population mean μ. Find the margin of error M.E. that corresponds to a sample of size 23 with a mean of 66.3 and a standard deviation of 19.9 at a confidence level of 99%.

Report ME accurate to one decimal place because the sample statistics are presented with this accuracy.

M.E. =

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

3) The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 40.2 for a sample of size 305 and standard deviation 6.9.

Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 90% 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).

_____ < μ < ______

Answer should be obtained without any preliminary rounding.

Answer 1