In a survey, 32 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $32 and standard deviation of $11. Construct a confidence interval at a 90% confidence level. Give your answers to one decimal place.        ±±  Interpret your confidence interval in the context of this problem.

You measure 35 textbooks' weights, and find they have a mean weight of 78 ounces. Assume the population standard deviation is 2.1 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places < F<

In a survey, 25 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $43 and standard deviation of $18. Construct a confidence interval at a 98% confidence level. Give your answers to one decimal place. ± Interpret your confidence interval in the context of this problem.

You measure 30 textbooks' weights, and find they have a mean weight of 58 ounces. Assume the population standard deviation is 5.7 ounces. Based on this, construct a 99% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places I am 99% confident that the mean weight of textbooks is between ounces. and

In a survey, 14 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $30 and standard deviation of $20. Construct a confidence interval at a 80% confidence level.Give your answers to one decimal place.±± Interpret your confidence interval in the context of this problem.

You measure 44 turtles' weights, and find they have a mean weight of 36 pounds. Assume the population standard deviation is 7.9 pounds. Based on this, construct a 90% confidence interval for the true population mean turtle weight. Give your answers as decimals, to two places I pounds OR <με pounds

You measure 22 backpacks' weights, and find they have a mean weight of 30 ounces. Assume the population standard deviation is 11.8 ounces. Based on this, what is the maximal margin of error associated with a 90% confidence interval for the true population mean backpack weight. Give your answer as a decimal, to two places ounces

The high price of medicines is a source of major expense for those seniors in the United States who have to pay for these medicines themselves. A random sample of 1300 seniors who pay for their medicines showed that they spent an average of $ 4300 last year on medicines with a standard deviation of $ 900 . Make a 95 % confidence interval for the corresponding population mean. Round your answers to cents.