In queueing system What is the average Queue lenght ? 2.- What is the expected waiting time ? costumers per hour, M= 15 costumers per hour.
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- how do you calculate the waiting time before a player loosesIn May 2008, CNN reported that Sports Utility Vehicles (SUVs) are plunging toward the "endangered list". Due to soaring oil prices and environmental concerns, consumers are replacing gas-guzzling vehicles with fuel-efficientsmaller cars. As a result, there has been a big drop in the demand for new as well as used SUVs. A sales manager of a used car dealership for SUVs believes that it takes more than 90 days, on average, to sell an sUV. In order to test his claim, he samples 40 recently sold SUVs and find that it took an average of 95 days to sell an SUV. He believes that the population standard deviation is fairly stable at 20 days. Determine if the sales manager's claim is justifiable at 0.05Groupon, an online Web site, offers its subscribers at least one special deal per day to local businesses in their cities such as places to eat, health-related activities (spas or fitness centers), places to see (museums), a variety of activities such as golfing or sky diving, or other specials (such as a Gap Groupon or a gourmet fruit basket). Since December 2008, the number of subscribers has increased from 400 to more than 50 million in more than 400 markets, in over 40 countries (Groupon Hits 50m Subscribers, 2011). To date, Groupon claims that more than 30 million Groupons have been sold, saving subscribers nearly $1.3 billion. From a survey of students at one university, it was found that during the past week, the following number and category of Groupons were purchased: 230 (activities); 80 (food); 90 (health-related items), and 50 (other).a. Graph these purchases with a pie chart.b. Graph these purchases with a bar chart.
- The manager of human resource department wants to see if there is anyrelationship between staffs’ salary (in 1000TK) and their experience (in years).---------------------------+| id salary experience ||--------------------------|| 1 15 15.5 || 2 18 17 || 3 16.5 17 || 4 16.3 18 || 5 22 19 ||--------------------------|| 6 19.9 18 || 7 24 20 || 8 18.5 18.5 || 9 28.3 22 || 10 17.5 19.5 ||--------------------------|| 11 24.5 19.5 || 12 16.2 17.5 |---------------------------------(a) Write down the regression model of salary on experience indicating dependentvariable, independent variables and the associated parameters.(b) Obtain the least squares estimates of the model parameters and interpret them.(c) Draw a scatter plot and the regression line in the same coordinate.(d) Obtain TSS, RSS and ESS.(e) Obtain R-square value and interpret the result.(f) Obtain the estimate of the error variance.(g) Obtain 95% confidence interval for slope and interpret it.(h) Test the hypothesis that there is…AN OUTDOOR HOT DOG VENDOR SELLS AN AVERAGE OF 60 HOT DOGS PER DAY IN DRY WEATHER AND AN AVERAGE OF 20 PER DAY IN WET WEATHER. IF THE WEATHER IN THIS AREA IS WET 15% OF THE TIME, DETERMINE THE EXPECTED (AVERAGE) NUMBER OF HOT DOGS SOLD PER DAY.We wish to demonstrate that the average time to graduate from college is affected by the students having taken AP calculus in high school. Specifically we wish to demonstrate that students who have taken AP calculus in high school gradate an average of at most 0.25 years sooner than students who have not taken AP calculus in high school. If we let μ1 demote the average time to graduate for students who have not taken AP calculus and μ2 denote the average time to graduate for students who have taken AP calculus, then select the appropriate alternative hypothesis: a. μ1-μ2 = 0 b. μ1-μ2-0.25 < 0 c. μ1-μ2-0.25>0 Please explain
- An electronics retailer is developing a model for insur-ance policies on new cell phone purchases. It estimates that 60% of customers never make a claim, 25% of cus-tomers require a small repair costing an average of $50, and 15% of customers request a full refund costing $200.What is the long-term average cost the retailer shouldexpect to pay to its customers per claim?The past records of a supermarket show that its customers spend an averageof $95 per visit at this store. Recently the management of the store initiated a promotionalcampaign according to which each customer receives points based on the total moneyspent at the store, and these points can be used to buy products at the store. Themanagement expects that as a result of this campaign, the customers should beencouraged to spend more money at the store. To check whether this is true, the managerof the store took a sample of 14 customers who visited the store. The following data givethe money (in dollars) spent by these customers at this supermarket during their visits. 109 136 107 116 101 109 110 94 101 97 104 83 67 120Assume that the money spent by all customers at this supermarket has a normaldistribution. Using a 5% significance level, can you conclude that the mean amount ofmoney spent by all customers at this supermarket after the campaign was started is morethan $95?The following table shows the security staff that the company must provide onsite at a fund-raising event next week. The event starts at 10.00 am and ends at 10.00pm. You are required to staff each hour, with the required number of security personnel, showing how many of them you have assigned to work at each hour and if there is any over-staffing for each hour. The security staff work in three (3) hour shifts Please see question and table attached
- An embroidery business in the city of Obregon manufactures clothing, has seen high demand in the months of September-October 2020.The following data was collected: A total of 6000 Levis pants were manufactured in the month of September and October, which qualified as a demanding product. The stand was working hard, in a total of 60 days, from Monday to Sunday, 8 hours shifts, of that time 15 min were for changing the embroidery rolls and one hour for the workers. Due to the high demand of these months there are no Kanban times. Instructions: Determine the parts per hour of work that were produced during the months of September and October 2020. Important: Use the formula (the one I put in the image)We wish to demonstrate that the average time to graduate from Tulane is affected by the students having taken AP calculus in high school. Specially, we wish to demonstrate that students who have taken AP calculus in high school graduate an average of more than 0.25 years sooner than students who have not taken AP calculus in high school. If we let denote the average time to graduate for students who have not taken AP calculus and denotes the average time to graduate for students who have taken AP calculus, then select the appropriate alternative hypothesis.The management of Mark's Department Store estimates that approximately 2% of all shoppers enter the store with the intention of shoplifting. Of those people who engage in the act of shoplifting, 94% are apprehended by security guards using closed-circuit television (CCTV) and an electronic article surveillance system. The latter, also called a tag-and-alarm system, involves the use of a tag or label that is attached to an item. The tag is deactivated or detached at the time of purchase of the item; failure to do so will trigger an alarm when the item is carried through the gates. Of the other 98% of the shoppers, 1% are mistakenly identified as shoplifters by security guards watching them on CCTV or have triggered the alarm because the salesperson failed to deactivate or detach the tag. If a shopper is detained by security, what is the probability that the person was in fact a shoplifter? (Round your answer to two decimal places.)