The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 60.7 for a sample of size 1036 and standard deviation 5.8. (a) 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).  < μμ <  (b) Interpret the confidence interval specific to this problem.

In a survey, 30 people were asked how much they spent on their child’s last birthday gift. The results were roughly bell-shapes with a mean of $38.9 and standard deviation of $3.6. Estimate how much a typical parent would spend on their child’s birthday gift (use a 80% confidence level). Give your answers to 3 decimal places. Express your answers in the format of x̄ In a survey, 30 people were asked how much they spent on their child’s last birthday gift. The results were roughly bell-shapes with a mean of $38.9 and standard deviation of $3.6. Estimate how much a typical parent would spend on their child’s birthday gift (use a 80% confidence level). Give your answers to 3 decimal places. Express your answers in the format of x̄ ≠ E.

A nationwide test taken by high school sophomores and juniors has three sections, each scored on a scale of 20 to 80. In a recent year, the national mean score for the writing section was 50.4with a standard deviation of 9.1 a. According to Chebyshev's theorem at least ? of the score lies between 3.2 and 68.6 b. According to Chebyshev's theorem at least 56% of the fares lies between ? and ? (Round your answer to 2 decimal places.)

Assume the average selling price for houses in a certain county is ​$308,000 with a standard deviation of ​$57, 000. Using​ Chebychev's Theorem, determine the range of prices that includes at least 91​% of the homes around the mean.