University researchers published a working paper. One of the objectives of the study was to determine whether ride-share drivers actually make a profit.
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University researchers published a working paper. One of the objectives of the study was to determine whether ride-share drivers actually make a profit.
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- The Federal Bureau of Investigation reports state-level and national data on crimes. An investigator compares the incidence of crime in the United States in 1991 and in 2001. In 1991, there were 28,000 crimes compared with 22,000 in 2001. Can you conclude that the US became more law-abiding over that time period?A social media app is conducting a study on the amount of time users spend on the app. They collect the following variables. 1. Age Years: How old they are in years? 2. Income: Monthly Income 3. Location: What country do they live in? 4. Device: Do they use an iPhone, Samsung, other? 5. Service: Who provides their mobile phone service? For example: T-Mobile, At&t, Verizon, ect 6. Hours: How many hours do they spend on the app per week. Which variable could the research construct a one proportion z-interval for? And Why would you choose that variable?Government economic studies reveal that young adults, not middle-aged or older adults, are having the most difficult time in today’s economy. Although the nation’s labor market shows a decline in the unemployment rate, the percentage of young adults, ages 18 to 24, currently employed (54 percent) is at the lowest level since the government data collection began in 1948. If you were working for a national survey organization doing a general public survey of young adults and older adults, what topics and questions would you design into your survey to elaborate on this finding?
- I need help with this question.You read a study about how opioid addiction can only be treated by addiction centers. It was paid for by some addiction recovery centers. It was done by looking at 14 of their patients. Do you think this a valid study?Explain your answer.Numerous studies have shown that watching too much television hurts children’s school grades. Others have argued that television is not necessarily a bad thing for children (Mail Online; July 2009). Like books and stories, television not only entertains, it also exposes a child to new information about the world. While watching too much TV is harmful, a little bit may actually help. Suppose a researcher gathers information on the grade point average (GPA) of 28 middle school children and the number of hours of TV they watch per week. GPA Hours TV 3.24 19 3.1 21 3.24 18 2.61 30 3.03 23 3.37 10 1.6 36 3.2 10 2.96 13 2.18 31 2.5 33 2.95 4 2.72 25 3.05 21 3.45 8 2.49 27 3.62 11 2.33 29 2.36 30 3.28 10 3.35 15 2.64 18 2.88 24 2.02 29 2.6 22 3.18 21 3.31 4 a. Estimate a quadratic regression model where the GPA of…
- How profitable are different sectors of the stock market? One way to answer such a question is to examine profit as a percentage of stockholder equity. A random sample of 32 retail stocks such as Toys 'R' Us, Best Buy, and Gap was studied for x1, profit as a percentage of stockholder equity. The result was x1 = 14.0. A random sample of 36 utility (gas and electric) stocks such as Boston Edison, Wisconsin Energy, and Texas Utilities was studied for x2, profit as a percentage of stockholder equity. The result was x2 = 10.3. Assume that ?1 = 4.5 and ?2 = 3.0. (a) Categorize the problem below according to parameter being estimated, proportion p, mean ?, difference of means ?1 – ?2, or difference of proportions p1 – p2. Then solve the problem. p1 – p2?1 – ?2 ?p (b) Let ?1 represent the population mean profit as a percentage of stockholder equity for retail stocks, and let ?2 represent the population mean profit as a percentage of stockholder equity for utility stocks. Find a 99%…New Zealand requires cyclists to wear cycle helmets on public roads and this is enforced with fines. Most other countries have no mandatory helmet law, and a few have a law but do not enforce it. Finland is an example of a country that has a mandatory cycle helmet law but does not enforce it. A road safety researcher is interested in whether the proportion of cyclists in New Zealand do actually wear helmets is different to the proportion of cyclists in Finland who wear helmets. She has data from a survey which gives the following information: New Zealand: Of 210 New Zealand cyclists surveyed, 100 wear a helmet while cycling. Finland: Of 630 Finnish cyclists surveyed, 290 wear a helmet while cycling. Say that the true population proportion of New Zealand cyclists who wear a helmet is p1 and the true population proportion of Finnish cyclists who wear a helmet is p2. If our null hypothesis is H0: p1 - p2 = 0 and our alternative hypothesis is Ha: p1 - p2 ≠ 0, what is the z test…The St. Lucian Government is interested in predicting the number of weekly riders on the public buses using the following variables: • Price of bus trips rer week • The population in the city • The monthly income of riders • Average rate to park your personal vehicle Number of weekly riders 192,000 Price per week Population of city 1,800,000 Monthly income of riders Average parking rates per month City $15 $5,800 $50 $6,200 $6,400 $6,500 $50 $60 190,400 $15 1,790,000 191,200 $15 1,780,000 4 $25 $60 177,600 176,800 1,778,000 $25 $6,550 $60 $70 5 1,750,000 1,740,000 6. 178,400 $25 $6,580 180,800 $25 1,725,000 $8,200 $75 175,200 174,400 $30 $30 1,725,000 $8,600 $8,800 8 $75 9. 1,720,000 $75 173,920 172,800 163,200 10 $30 $80 1,705,000 1,710,000 1,700,000 $9,200 $9,630 $10,570 11 $30 $80 12 $40 $80 $11,330 $11,600 S11,800 13 161,600 $40 1,695,000 1,695,000 $85 14 161,600 160,800 $40 $100 15 $40 1,690,000 $105 $40 1,630,000 1,640,000 1,635,000 S11,830 $12.650 S13.000 16 159,200 $105 17…
- A social media app is conducting a study on the amount of time users spend on the app. They collect the following variables. Age Years: How old they are in years? Income: Monthly Income Location: What country do they live in? Device: Do they use an iPhone, Samsung, other? Service: Who provides their mobile phone service? For example: T-Mobile, At&t, Verizon, ect Hours: How many hours do they spend on the app per week. A) Which variable could the research construct a one proportion z-interval for? B) The social media app just launched a new algorithm that suggest content in an effort to increase the amount of time the user spends on the app. The researchers want to use the survey results to see if there is statistically significant evidence that on average users spend more than 10 hours per week on the social media app. The researchers found in their sample of 44 users, the mean hours spent on the app is 10.5 hours with a standard deviation of 5.675 hours. Which type of hypothesis test…For which reason is it a problem when journalists only report on one study? a. It can lead people to think journalists are scientists. b. It can cause people to interrogate a study’s validities. c. It can lead people to value one study over decades of previous research. d. It can make journalists look bad.City Hotel Room Rate ($) Entertainment ($) Boston 144 161 Denver 96 103 Nashville 88 103 New Orleans 112 143 Phoenix 89 100 San Diego 100 119 San Francisco 137 166 San Jose 93 138 Tampa 86 99 Concur Technologies, Inc., is a large expense-management company located in Redmond, Washington. The Wall Street Journal asked Concur to examine the data from 8.3 million expense reports to provide insights regarding business travel expenses. Their analysis of the data showed that New York was the most expensive city, with an average daily hotel room rate of $198 and an average amount spent on entertainment, including group meals and tickets for shows, sports, and other events, of $172. In comparison, the U.S. averages for these two categories were $89 for the room rate and $99 for entertainment. The table in the Excel Online file below shows the average daily hotel room rate and the amount spent on entertainment for a random sample of 9 of the 25 most visited U.S. cities (The…