Home /
Expert Answers /
Statistics and Probability /
you-measure-38-dogs-39-weights-and-find-they-have-a-mean-weight-of-63-ounces-assume-the-population-s-pa945

You measure 38 dogs' weights, and find they have a mean weight of 63 ounces. Assume the population standard deviation is 13.2 ounces. Based on this, construct a 99% confidence interval for the true population mean dog weight.

Give your answers as decimals, to two places

___ ±___ ounces

The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 61.8 for a sample of size 797 and standard deviation 17.8. 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).

___< ?< ___

Answer should be obtained without any preliminary rounding.

In a survey, 19 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $41 and standard deviation of $3. Find the margin of error at a 99% confidence level.

Give your answer to two decimal places._____

You measure 38 watermelons' weights, and find they have a mean weight of 67 ounces. Assume the population standard deviation is 8.4 ounces. Based on this, construct a 90% confidence interval for the true population mean watermelon weight.

Give your answers as decimals, to two places

____±___ ounces