Compare the means of each group (ASPD and no ASPD). What can you say about the narcissism scores of the ASPD group compared to the no ASPD group?
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Compare the means of each group (ASPD and no ASPD). What can you say about the narcissism scores of the ASPD group compared to the no ASPD group?
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- A 90 percent confidence interval is to be created to estimate the proportion of television viewers in a certain areawho favor moving the broadcast of the late weeknight news to an hour earlier than it is currently. Initially, theconfidence interval will be created using a simple random sample of 9,000 viewers in the area. Assuming that thesample proportion does not change, what would be the relationship between the width of the original confidenceinterval and the width of a second 90 percent confidence interval that is created based on a sample of only 1,000viewers in the area?(A) The second confidence interval would be 9 times as wide as the original confidence interval.(B) The second confidence interval would be 3 times as wide as the original confidence interval.(C) The width of the second confidence interval would be equal to the width of the original confidence interval.(D) The second confidence interval would be 1/3 as wide as the original confidence interval.(E) The second…Teddy Bower is an outdoor clothing and accessories chain that purchases a line of parkasat $10 each from its Asian supplier, TeddySports. Unfortunately, at the time of the orderplacement, demand is still uncertain: Teddy Bower forecasts that its demand is normallydistributed with a mean of 2100 and a standard deviation of 1200. Teddy Bower sellsthese parkas at $22 each. Unsold parkas have little salvage value; Teddy Bower simplygives them away to a charity (and also doesn’t collect a tax benefit for the donation).a. What is the probability this parka turns out to be a “dog,” defined as a product thatsells less than half of the forecast? b. How many parkas should Teddy Bower buy from TeddySports to maximize expectedprofit? c. If Teddy Bower orders 3000 parkas, what is the in-stock probability? d. If Teddy Bower orders 3000 parkas, what is the expected leftover inventory? e. If Teddy Bower orders 3000 parkas, what are expected sales? f. If Teddy Bower orders 3000 parkas, what is expected…1. A recent survey showed that from a sample of 500 packages delivered by a Postal Service, 480were delivered on time. a) Construct a 95% confidence interval for the proportion of all packages that are deliveredon time by the Postal Service.
- a confidence interval inappropiately using a z statistics instead of a t statistic will give a narrower intervalThe National Weight Control Registry tries to mine secrets of success from people who lost at least 30 pounds and kept it off for at least a year. It reports that out of 2,720 registrants, 439 were on a low-carbohydrate diet (less than 90 grams a day). a. Develop a 95% confidence interval for the proportion of people on a low-carbohydrate diet.b. Is it possible that the population percentage is 16%? c. How large a sample is needed to estimate the proportion within 0.55%?A farmer wants to test the effectiveness of a pest control method in allowing strawberry blooms to yield marketable strawberries. Of a random sample of 100 blooms,77 yield marketable strawberries. Is this evidence that two thirds or more of all blooms grown with this pest control method end up as marketable strawberries? The 95%large-sample confidence interval for the proportion of blooms that yield marketable strawberries is: A. 0.77± 0.042 B. 0.77±0.082 C. 0.77±0.0034 D. 0.77±0.0017G5
- The National Weight Control Registry tries to mine secrets of successfrom people who lost at least 30 pounds and kept it off for at least a year.It reports that out of 2,720 registrants, 439 were on a low-carbohydrate diet (less than 90 grams a day). a. Develop a 95% confidence interval for the proportion ofpeople on a low-carbohydrate diet. b. Is it possible that the population percentage is 16%? c. How large a sample is needed to estimate the proportionwithin 0.55%?3.Michael wants to make a confidence interval estimate for the proportion of community members in favor of a tax increase for more local school funding. If he wants the margin of error to be no more than 0.025 at a 90% confidence level, a)What is the required sample size required to obtain the desired margin of errorA manufacturing company regularly consumes a special type of glue pur-chased from a foreign supplier. Because the supplier is foreign, the time gap betweenplacing an order and receiving the shipment against that order is long and uncertain.This time gap is called “lead time.” From past experience, the materials manager notesthat the company’s demand for glue during the uncertain lead time is normally dis-tributed with a mean of 187.6 gallons and a standard deviation of 12.4 gallons. Thecompany follows a policy of placing an order when the glue stock falls to a pre-determined value called the “reorder point.” Note that if the reorder point is x gallonsand the demand during lead time exceeds x gallons, the glue would go “stock-out” andthe production process would have to stop. Stock-out conditions are therefore serious.a. If the reorder point is kept at 187.6 gallons (equal to the mean demand duringlead time) what is the probability that a stock-out condition would occur?b. If the…
- A risk manager is analyzing a 1-day 98% VaR model. Assuming 252 days in a year, what is the maximum number of daily losses exceeding the 1-day 98% VaR that is acceptable in a 1-year backtest to conclude, at a 95% confidence level, that the model is calibrated correctly? a)5 b)9 c)10 d)12A consulting firm wants to study communication deficiencies in the health care industry. A random sample of 75 health care clinicians reveals the following: Time wasted in a day due to outdated communication technologies: X=47 minutes, S=11 minutes. Forty health care clinicians cite inefficiency of pagers as the reason for the wasted time A.)Construct a 95% confidence interval estimate for the population mean time wasted in a day due to outdated communication technologies. ___ <u< ___ B.)Construct a 99% confidence interval estimate for the population mean time wasted in a day due to inefficiency of pagers ___ <u< ___ C.)Construct a 90% confidence interval estimate for the population mean time wasted in a day due to inefficiency of pagers ___ <u< ___In simple linear regression, at what value of the independent variable, X, will the 95% confidence interval for the average value of Y be narrowest? At what value will the 95% prediction interval for the value of Y for a single n ew observation be narrowest?