A researcher is interested in finding a 95% confidence interval for the mean number minutesstudents are concentrating on their professor during a one hour statistics lecture. The studyincluded 124 students who averaged 33.8 minutes concentrating on their professor during thehour lecture. The standard deviation was 12.6 minutes. Round answers to 3 decimal placeswhere possible.a. To compute the confidence interval use a ? distribution.b. With 95% confidence the population mean minutes of concentration is betweenandminutes.c. If many groups of 124 randomly selected members are studied, then a different confidenceinterval would be produced from each group. Aboutpercent of these confidenceintervals will contain the true population mean minutes of concentration and aboutpercent will not contain the true population mean minutes of concentration. You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based onprevious study, you believe the population standard deviation is approximately o = 56.5 dollars. Youwould like to be 99% confident that your estimate is within 2.5 dollar(s) of average spending on thebirthday parties. How many parents do you have to sample?n =

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The mayor is interested in finding a 90% confidence interval for the mean number of pounds of trash per person per week that is generated in the city. The study included 158 residents whose mean number of pounds of trash generated per person per week was 34.4 pounds and the standard deviation was 7.2 pounds. Round answers to 3 decimal places where possible. a. With 90% confidence the population mean number of pounds per person per week is between and pounds. b. If many groups of 158 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean number of pounds of trash generated per person per week and about percent will not contain the true population mean number of pounds of trash generated per person per week.
A fitness center is interested in finding a 95% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center. Records of 219 members were looked at and their mean number of visits per week was 3.5 and the standard deviation was 1.6. Round answers to 3 decimal places where possible. With 95% confidence the population mean number of visits per week is between ___ and ___visits. If many groups of 219 randomly selected members are studied, then a different confidence interval would be produced from each group. About ___percent of these confidence intervals will contain the true population mean number of visits per week and about ____ percent will not contain the true population mean number of visits per week.
People with high blood pressure suffer from hypertension. Data on fasting blood sugar (milligrams/deciliter) and magnesium (milligrams/deciliter) in blood specimens collected from 60 patients diagnosed with hypertension were collected. The accompanying technology printout gives 90% confidence intervals for the mean fasting blood sugar (FBS) and mean magnesium level (MAG). Use this information to complete parts a through d below. Variable FBS MAG N 60 60 Mean 102.11 1.85238 StDev 38.91 0.05472 90% CI SE Mean 5.02 ( 93.72, 110.50 ) 0.00706 (1.84058, 1.86418) a. Locate and interpret the 90% confidence interval for mean fasting blood sugar on the printout. (Type integers or decimals. Do not round.) O A. The 90% confidence interval for mean fasting blood sugar indicates that 90% of all hypertensive patients will have a fasting blood sugar level between O B. The 90% confidence interval for mean fasting blood sugar indicates that 90% of hypertensive patients in the sample had a fasting blood…
In a random sample of 41 criminals convicted of a certain crime, it was determined that the mean length of sentencing was 62 months, with a standard deviation of 11 months. Construct and interpret a 90% confidence interval for the mean length of sentencing for this crime. Select the correct choice below and fill in the answer boxes to complete your choice. (Use ascending order. Round to one decimal place as needed.) O A. One can be 90% confident that the mean length of sentencing for the crime is between and months. O B. 90% of the sentences for the crime are between and months. OC. There is a 90% probability that the mean length of sentencing for the crime is between and months.
answer d
Please do question 5 parts c and d
Suppose that textbook weights are normally distributed. You measure 33 textbooks' weights, and find they have a mean weight of 61 ounces. Assume the population standard deviation is 13.2 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight. Round answers to 2 decimal places.
In a random sample of 38 families, the average weekly food expense was $95.60 with a standard deviation of $22.50. the distribution of weekly food expenses is normally distributed. Find the 99% confidence interval for the average weekly food expense. Round to two decimal places.
In a survey, 373 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $36.85 and standard deviation of $19.05. Estimate how much a typical parent would spend on their child's birthday gift (use a z-interval at a 80% confidence level). Give your answers to 2 decimal places. Express your answer in the format of E. $ + $
A fitness center is interested in finding a 90% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center. Records of 213 members were looked at and their mean number of visits per week was 2.2 and the standard deviation was 1.7. Round answers to 3 decimal places where possible. b. With 90% confidence the population mean number of visits per week is between ? and ? visits. c. If many groups of 213 randomly selected members are studied, then a different confidence interval would be produced from each group. About ?percent of these confidence intervals will contain the true population mean number of visits per week and about ? percent will not contain the true population mean number of visits per week.
Question 2 A researcher is interested in finding a 98% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 149 students who averaged 37.9 minutes concentrating on their professor during the hour lecture. The standard deviation was 10.6 minutes. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a? distribution. b. With 98% confidence the population mean minutes of concentration is between minutes. c. If many groups of 149 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean minutes of concentration and about percent will not contain the true population mean minutes of concentration. Hint: Hints Video [+] Submit Question and MacBook Air
A random sample of 21 lunch orders at Noodles & Company showed a mean bill of $13.54 with a standard deviation of $6.45. Find the 98 percent confidence interval for the mean bill of all lunch orders. (Round your answers to 4 decimal places.) The 98% confidence interval is from _____to______

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