HW5_SamplingD_Estimation_Apurvamohapatra

A sports shop selects a random sample and records the sales of items made in China and thosemade in America. Country of origin n mean St.Deviation           China 50 22.5 9.75           America 33 33.15 11.6                             What is the SE Mean for the sales from China?

7. It is well known that car buyers often add accessories to their new cars. A sample of 179 Ottawa purchasers yielded a sample mean of $5000 worth of accessories added to the purchase above the base sticker price. Suppose the cost of accessories purchased for all Ottawa has a standard deviation of $1500. (a) Calculate a 95% confidence interval for the average cost of accessories on Ottawa. - Section Break - (b) Determine the margin of error in estimating the average cost of accessories on Ottawa. (c) What sample size would be required to reduce the margin of error by 50%?

Calculate SP (the sum of products of deviations) for the following scores, Note: Bothmeans are decimal values, so the computational formula works well.X Y0 41 10 54 12 11 3

Question of the day: A machine is designed to produce insulating washers for electrical devices of average thickness of 0.025 cm. A random sample of 10 washers was found to have an average thickness of 0.024 cm with a standard deviation of 0.002 cm. Test the significance of the deviation. Value of t for 9 degrees of freedom at 5% level is 2.262?

0 2 A courier company guarantees its customers that the average time to pick up their packages is 20 minutes with a tolerance of ± 4 minutes. The company collected data on 30 actual arrival times and determined that the average is 20 minutes and standard deviation of this sample was 1 minutes. What is the Cpk of this package service process? 01 Less than 1 O Great than 2 1.33

Q.3 What is the difference between ordinary least square and maximum likelihood ( ML ) estimators ? Also discuss their properties ?

MEAN ABSOLUTE DEVIATION Q.1) Find the mean absolute deviation for the set below. S = {85, 90, 68, 75, 79} A. В. C. D. 79.4 6.48 32.4 79 Sherrie just registered for her wedding. So far 6 items have been fulfilled on her registry. Find the Q.2) mean price of the fulfilled items. $29, $58, $15, $129, $75, $22 43.5 129 54.7 114 А. В. С. D. Find the mean absolute deviation of the fulfilled items on Sherrie's registry. $29 , $58, $15, $129, Q.3) $75, $22 196 54.7 114 32.67 C. D.

The reliability of an estimator is assessed in terms of its _____. Select one: a. mean  b. ease of computation c. coefficient of variation d. variance

Economic topic. Show your work A weighing machine without any display was used by an average of 320 persons a day with a standard deviation of 50 persons. When an attractive display was used on the machine, the average for 100 days increased by 15 persons. Can we say that the display did not help much? Use a level of significance of 0.05?

The 2018 statistics shows that the average life expectancy of females in Canada has risen to 83.9 years. Assuming the standard 1 deviation of their life expectancy was 7.4 yoars, determine the minimum percentage of females in Canada whose life expectancy was between 75.02 and 92.78 years. Type your numerical answer here. Numbers only

In 2008, SAT math scores were normally distributed with a mean of 522 and a standard deviation of 102. What percentage of test takers scoree between 420 and 624 on the math portion? 0.3173 0.6587 0.3413 0.6827

The average amount of debt families have is 2.5 times their annual income with a standard deviation 0.75 times their annual income. How much debt does a family have to have (relative to their annual income) to be in the top 5% with the LOWEST debt load?

A courier company guarantees its customers that the average time to pick up their packages is 20 minutes with a tolerance of 4 minutes. The company collected data on 30 actual arrival times and determined that the average is 20 minutes and standard deviation of this sample was 1 minutes. What is the Cpk of this package service process? O Less than 1 1.33 O Great than 2 01

SCCoast, an Internet provider in the Southeast, developed the following frequency distribution on the age of Internet users. Find the mean and the standard deviation. (Round squared deviations to nearest whole number and final answer to 2 decimal places.)   Age (years) Frequency 10 up to 20   3   20 up to 30   7   30 up to 40   18   40 up to 50   20   50 up to 60   12

A magazine conducts an annual survey in which readers rate their favorite cruise ship. All ships are rated on a 100-point scale, with higher values indicating better service. A sample of 33 ships that carry fewer than 500 passengers resulted in an average rating of 85.59, and a sample of 44 ships that carry 500 or more passengers provided an average rating of 81.40. Assume that the population standard deviation is 4.55 for ships that carry fewer than 500 passengers and 3.97 for ships that carry 500 or more passengers. A) What is the point estimate of the difference between the population mean rating for ships that carry fewer than 500 passengers and the population mean rating for ships that carry 500 or more passengers? (Use smaller cruise ships − larger cruise ships.)   (b) At 95% confidence, what is the margin of error? (Round your answer to two decimal places.)   (c) What is a 95% confidence interval estimate of the difference between the population mean ratings for the two sizes of…

The state of California has a mean annual rainfall of 22 inches, whereas the state ofNew York has a mean annual rainfall of 42 inches (Current Results website, October 27,2012). Assume that the standard deviation for both states is 4 inches. A sample of 30 yearsof rainfall for California and a sample of 45 years of rainfall for New York has been taken.a. Show the probability distribution of the sample mean annual rainfall for California

Suppose a baker wants to know, on average, how many pastries they sell in a day. They sampled over 4 days. On the first day they sold 10, on the second day they sold 12, on the third day they sold 18, and on the fourth day they sold 16. The population standard deviation of pastry sales is 3. What is the point estimate (average) number of pastries sold? 26 08 056 O 14 Nex

The life of button batteries is normally distributed with a mean of 68.1 hours and a standard deviation of 18 hours 936 of the button batteries will last more than how many hours? (2 decimal places)

For the Given values ​​of 56, 67.9, 68, 53.8 and 69.8, Calculate a) Mean b) Algebraic Sum of deviation c) Variance d) Standard Deviation.

The records kept by a large department store indicate that, in the past, weekly sales have averaged $5775. In order to increase sales, the store recently began an aggressive advertising campaign. After 15 weeks, sales average $6350 with standard deviation of $850. Should the store continue the advertising campaign? Set a = .05.

(26) A company is interested in determining whether the average life of HP and Epson printers is different. A sample of HP and Epson printers result in the following: HP: average life-7 years Standard deviation -2 years n- 10 Epson: average life - 5.5 years Standard deviation -2.5 yearsn-8 At a-.05, is there a statistically significant difference between the longevity of the two brands of printers?

A health expert evaluates the sleeping patterns of adults. Each week she randomly selects 40 adults and calculates their average sleep time. Over many weeks, she finds that 5% of average sleep time is less than 3 hours and 5% of average sleep time is more than 3.4 hours. What are the mean and standard deviation (in hours) of sleep time for the population? (Round "Mean" to 1 decimal places and "standard deviation" to 3 decimal places.) Mean Standard deviation

Consider a very large number of students taking a college entrance exam such as the SAT. And suppose the mean score on the mathematics section of the SAT is 570 with a standard deviation of 40.a. Find the z-score for a student who scored 600.b. A student is told that his z-score on this test is -1.5. What was his actual SAT math score?

A large consumer goods company ran a television advertisement for one of its soap products. On the basis of a survey that was conducted, probabilities were assigned to the following events. B = individual purchased the product S = individual recalls seeing the advertisement BNS = individual purchased the product and recalls seeing the advertisement The probabilities assigned were P(B) = 0.20, P(S) = 0.40, and P(BnS) = 0.12. %3D a. What is the probability of an individual's purchasing the product given that the individual recalls seeing the advertisement (to 1 decimal)? Does seeing the advertisement increase the probability that the individual will purchase the product? - Select your answer- As a decision maker, would you recommend continuing the advertisement (assuming that the cost is reasonable)? - Select your answer - b. Assume that individuals who do not purchase the company's soap product buy from its competitors. What would be your estimate of the company's market share (to the…

Suppose ACT Reading scores are normally distributed with a mean of 21.4 and a standard deviation of 5.9. A university plans to award scholarships to students whose scores are in the top 9%. What is the minimum score required for the scholarship? Round your answer to the nearest tenth, if necessary.

Consider the following events: Scientists reveal that eating oranges decreases the risk of diabetes, and at the same time, farmers use a new fertilizer that makes orange trees produce more oranges. Show the effect of these two events on the market for oranges.

Consider a sample with data values of 26, 24, 23, 15, 32, 36, 28, and 24. Compute the range, interquartile range, variance, and standard deviation. Round to 2 decimals, if necessary. Range Interquartile range Variance Standard deviation

The average and standard deviation of the amount of GST paid by all sole trader businesses in Australia in a twelve month period were $5.602 thousand and $1.637 thousand respectively. If a sample of 120 sole trader businesses was chosen, find the sample average value above which only 15% of sample averages would lie. Give your answer in dollars (to the nearest dollar).

Question 3 Saved 4) Listen A customer service team receives an average of 376 emails every day. Assume that the standard deviation for the number of emails is 96 emails. A random sample of 40 days was selected. a. What is the expected value of the sample mean? b. What is the standard deviation of the sample mean? Round your answer to two decimal places (e.g. 2.12). c. What is the probability that the average number of emails received was between 360 and 372? Round your answer to two decimal places with a leading zero (e.g. 0.18).

A large milling machine produces steel rods to certain specifications. The machine is considered to be running normally if the standard deviation of the diameter of the rods is at most 0.42 millimeters. The line supervisor needs to test the machine is for normal functionality. The quality inspector takes a sample of 45 rods and finds that the sample standard deviation is 0.49. What is the test statistic? Select one: а. 59.89 b. 48.63 с. 50.50 d. 52.45