1. The total shopping bills of 100 shoppers at a neighbourhood supermarket have a mean of...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
1. The total shopping bills of 100 shoppers at a neighbourhood supermarket have a mean of $50 and a standard deviation of $12.50. What is the estimate of the population mean? What is a reasonable error band for this estimate? 2. A research firm conducted a survey to determine thelaverage number of cigarettes smoked per day by residents of a particular neighbourhood. A sample of 49 residents revealed that the average for the sample was 20 and with a standard deviation of 5. a. What is the point estimate of the population mean? b. Construct a 95% confidence interval for the mean. c. What if 64 smokers were sampled with the same sample characteristics? 3. A petrol station looked at the filling habits of a sample of 81 drivers and found that on the average the amount of petrol purchased is 35 litres with a standard deviation of 6 litres. Construct 90%, 95%, and 99% confidence intervals for the estimates of the population mean. 4. A random sample of 9 automobile tyres was drawn from a large production run of a certain brand of tyres. The mean life time of the tyres in the sample is 22010 miles. The sample standard deviation is 2520 miles. What is the interval estimate of the population mean at a 95% level of confidence? 5. In an election poll, it was reported that a survey of 1600 voters resulted in 60% supporting Party A and 40% supporting Party B. What is the point estimate of the proportion of the population who support Party A? Construct a 90% and a 95% confidence interval. 1. The total shopping bills of 100 shoppers at a neighbourhood supermarket have a mean of $50 and a standard deviation of $12.50. What is the estimate of the population mean? What is a reasonable error band for this estimate? 2. A research firm conducted a survey to determine thelaverage number of cigarettes smoked per day by residents of a particular neighbourhood. A sample of 49 residents revealed that the average for the sample was 20 and with a standard deviation of 5. a. What is the point estimate of the population mean? b. Construct a 95% confidence interval for the mean. c. What if 64 smokers were sampled with the same sample characteristics? 3. A petrol station looked at the filling habits of a sample of 81 drivers and found that on the average the amount of petrol purchased is 35 litres with a standard deviation of 6 litres. Construct 90%, 95%, and 99% confidence intervals for the estimates of the population mean. 4. A random sample of 9 automobile tyres was drawn from a large production run of a certain brand of tyres. The mean life time of the tyres in the sample is 22010 miles. The sample standard deviation is 2520 miles. What is the interval estimate of the population mean at a 95% level of confidence? 5. In an election poll, it was reported that a survey of 1600 voters resulted in 60% supporting Party A and 40% supporting Party B. What is the point estimate of the proportion of the population who support Party A? Construct a 90% and a 95% confidence interval.
Expert Answer:
Answer rating: 100% (QA)
Lets address each of these statistical problems step by step 1 The total shopping bills of 100 shoppers at a neighborhood supermarket have a mean of 50 and a standard deviation of 1250 a The estimate ... View the full answer
Related Book For
Essentials Of Business Statistics
ISBN: 9780078020537
5th Edition
Authors: Bruce Bowerman, Richard Connell, Emily Murphree, Burdeane Or
Posted Date:
Students also viewed these finance questions
-
Design the memory mapping between the cache memory of 8 MB to the main memory of 4 GB using way set associative method where the block or page or frame size is of 4 KB. Consider each memory location...
-
Managing Scope Changes Case Study Scope changes on a project can occur regardless of how well the project is planned or executed. Scope changes can be the result of something that was omitted during...
-
A researcher wanted to find out if there was difference between older movie goers and younger movie goers with respect to their estimates of a successful actors income. The researcher first...
-
Burke Fabricators completed two jobs in June. Burke Fabricators recorded the following costs assigned to the jobs by the companys activity-based costing system: Job 622 required 2,400 parts, 77,500...
-
Classification of Costs and Interest Capitalization On January 1, 2010, Blair Corporation purchased for $500,000 a tract of land (site number 101) with a building. Blair paid a real estate brokers...
-
Find the mass of the surface in Problem 24 if the density if proportional to (a) The distance from the z-axis, and (b) The distance from the xy-plane?
-
Plaintiffs operated a concession foods business called Festival Foods that provided food services at carnivals and festivals. The tangible assets of the business included a truck and servicing...
-
Cherry Jones owns a homeopathic medicine company called Faithhealers. She sells vitamins and other relatively nonperishable products for those who want choices regarding alternative medicine. Cherry...
-
6. Consider two G.P.'s. 2, 22, 23, and 4, 4, 4, of 60 and n terms respectively. If the 225 n geometric mean of all the 60 + n terms is (2), then k(n-k) is equal to: (a) 560 (b) 1540 (c) 1330 (d) 2600
-
Ayayai Hotels Ltd. (AHL) is a small boutique hotel that provides 44 suites that can be rented by the day, week, or month. Food service is available through room service as well. In addition, there...
-
What is the reducing agent in this equation: NaNO3 (aq) +Pb (s) --------> NaNO2 (aq) +PbO (s)
-
Find each limit in Problems 11-18, if it exists. \(\lim _{n ightarrow \infty} \frac{3 n-1}{1-2 n}\)
-
Find the antiderivative by using areas in Problems 9-22. \(\int(3 x+4) d x\)
-
Find the antiderivative by using areas in Problems 9-22. \(\int(3+x) d x\)
-
Find each limit in Problems 11-18, if it exists. \(\lim _{n ightarrow \infty} \frac{n}{5,000-n}\)
-
Consider the sequence \(6,6.6,6.66,6.666, \cdots\). What do you think is the appropriate limit of this sequence?
-
Which of the following is a limitation of self-report crimesurveys? a. Not allcrimes come to the attention of the police. b. People may have a hard time rememberinghow many crimes they have...
-
Determine the center and radius of each circle. Sketch each circle. 4x 2 + 4y 2 9 = 16y
-
Develop a table of row percentages for the contingency table you set up in Exercise 2.67. Using these row percentages, construct a percentage frequency distribution of overall mechanical quality...
-
An article in Fortune magazine reported on the rapid rise of fees and expenses charged by mutual funds. Assuming that stock fund expenses and municipal bond fund expenses are each approximately...
-
Suppose that the number of accidents occurring in an industrial plant is described by a Poisson distribution with an average of one accident per month. Let x denote the time (in months) between...
-
Refer to Problem 14.9. What would the loss of the seller of the put option be if, at expiration, XLB is trading at \($20?\) What would the profit of the seller be if, at expiration, XLB is trading at...
-
Ibrahim bought 200 shares of a stock trading in the Abu Dhabi Securities Exchange at AED 12 (United Arab Emirates dirham) per share. Over time, the price of the stock increased to AED 18 per share....
-
Which of the following methods is an investor least likely to use to terminate a futures contract? a. Exchanging cash for physical assets b. Permitting the contract to expire worthless c. Making an...
Study smarter with the SolutionInn App