Preliminary data analyses indicate that you can reasonably apply the z-interval procedure (Procedure 8.1 on page 339) in Exercises 8.69–8.74.
8.69 Venture-Capital Investments. Data on investments in the high-tech industry by venture capitalists are compiled by VentureOneCorporation and published in America’s Network Telecom Investor Supplement. A random sample of 18 venture-capital investments in the fiber optics business sector yielded the following data, in millions of dollars.
Determine and interpret a 95% confidence interval for the
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Introductory Statistics (10th Edition)
- Entrepreneur magazine ranks franchises using performance measures such as growth rate, number of locations, startup costs, and financial stability. The number of locations for the top 20 U.S. franchises follow (The World Almanac). No. U.S. Locations Franchise Franchise Hampton Inn No. U.S. Locations 1,825 4,152 Jan-Pro Franchising Intl. Inc. 14,621 ampm Hardee's 1,870 McDonald's 31,628 Pizza Hut Inc. 15,735 7-Eleven Inc. 37,341 Kumon Math & Reading Centers 26,609 Supercuts 2,249 Dunkin' Donuts 9,446 Days Inn 1,902 KFC Corp. 16,517 Jazzercise Inc. 7,504 Vanguard Cleaning Systems Servpro 2,290 1,526 33,899 Anytime Fitness 1,802 Matco Tools 1,731 Subway Denny's Inc. 1,744 Stratus Building Solutions 5,541 Use classes 0 - 4,999, 5,000-9,999, 10,000 14,999, and so forth to answer the following questions. a. Construct a frequency distribution and a percent frequency distribution of the number of U.S. locations for these top-ranked franchises. If your answer is "zero", enter "0". Round your…arrow_forwardYou decide to invest in stock in a particular type of company and set the guideline that you will only buy stock in companies that are ranked in the 80th percentile or above in terms of dividends paid in the previous year. You are looking at a company that ranked 7 out of 450 companies that paid dividends in 2019. a.Will this company qualifies for your portfolio? b.If you had the data on the total dividends paid by each of the 450 companies, which measure of average would be the most meaningful – mean, median, midrange, or mode? Explainarrow_forward4.72 Refer to Exercise 4.70. An honor society wishes to invite those scoring in the top 5% on the College Boards to join their society. Rofeso nce a. What score is required to be invited to join the society? b. What score separates the top 75% of the population from the bottom 25%? What do we call this value?arrow_forward
- 3.24: The data in the accompanying table are from the Organization for Economic Co-operation and Development (data.oecd.org/eduatt/population-with-tertiary-education.htm, retrieved February 18, 2018). Entries in the table are the percentage of 25- to 34-year-old people who have completed a 4-year college degree for 27 countries in 2016. Country Percentage of people age 25 to 34 with 4-year degree Country Percentage of people age 25 to 34 with 4-year degree Australia 49.3 Italy 25.6 Austria 39.7 Japan 60.1 Canada 60.6 Mexico 21.8 Colombia 28.1 New Zealand 43.4 Costa Rica 28.9 Norway 48.6 Czech Republic 32.6 Poland 43.5 Denmark 45.9 Portugal 35.0 Finland 41.1 Spain 41.0 France 44.0 Sweden 47,.2 Germany 30.5 Switzerland 48.8 Greece 41.0 Turkey 30.5 Hungary 30.4 United Kingdom 52.0 Iceland 43.3 United States 47.5 Israel 47.4…arrow_forwardFind the technique for gathering data in the study below.An analysis of a sample of 31,000 patients from New York hospitals suggests that the poor and the elderly sue for malpractice at one-fifth the rate of wealthier patients (Journal of the Medical Association).arrow_forwardYou may need to use the appropriate technology to answer this question. One particular professional association of investors conducts a weekly survey of its members to measure the percent who are bullish, bearish, and neutral on the stock market for the next six months. The survey results showed 38.2% bullish, 23.4% neutral, and 38.4% bearish. Assume these results are based on a sample of 300 members. (a) Over the long term, the proportion of bullish members is 0.39. Conduct a hypothesis test at the 5% level of significance to see if the current sample results show that bullish sentiment differs from its long term average of 0.39. What are your findings? Formulate the hypotheses that can be used to determine whether the bullish sentiment differs from its long term average of 0.39. Hop 20.39 Hip 0.39 HoP-0.39 HP 0.39 Ho: P 0.39 HDS 0.39 Find the value of the test statistic. (Round your answer to two decimal places.) 38 x Find the p-value. (Round your answer to four decimal places.)…arrow_forward
- The following table shows the total return and the number of funds for four categories of mutual funds. Excel File: data03-17.xlsx Type of Fund Number of Funds Total Return (%) Domestic Equity 9,191 4.65 International Equity 2,621 18.15 Specialty Stock 1,419 11.36 Hybrid 2,900 6.75 b. Is there any difficulty associated with using the "number of funds" as the weights in computing the weighted average total return in part (a)? Discuss. What else might be used for weights? (i) Using "number of funds" as weights will only be a good approximation if the amount invested in various funds is approximately equal. The amount invested in each fund could be used for weights. (ii) Using "number of funds" as weights results in a good…arrow_forwardh.w The EFISCEN wOod product model classifies wood products according to their life- span. There are four classifications: short (1 year), medium short (4 years)., medium long (16 years), and long (50 years). Based on data obtained from the European For- est Institute, the percentage of remaining wood products after t years for wood prod- ucts with long life-spans (such as those used in the building industry) is given by 100.3952 P(1) = 1 + 0.0316e0.0581 (a) What is the decay rate? (b) What is the percentage of remaining wood products after 10 years? (c) How long does it take for the percentage of remaining wood products to reach 50%? (d) Explain why the numerator given in the model is reasonable.arrow_forwardRefer to the data presented in Exercise 2.86. Note that there were 50% more accidents in the 25 to less than 30 age group than in the 20 to less than 25 age group. Does this suggest that the older group of drivers in this city is more accident- prone than the younger group? What other explanation might account for the difference in accident rates?arrow_forward
- The report “Undergraduate Students and Credit Cards in 2004: An Analysis of Usage Rates and Trends” (Nellie Mae, May 2005) estimated that 21% of undergraduates with credit cards pay them off each month and that the average outstanding balance on undergraduates’ credit cards is $2169. These estimates were based on an online survey that was sent to 1260 students. Responses were received from 132 of these students. Is it reasonable to generalize the reported estimates to the population of all undergraduate students? Address two possible sources of bias, and name the bias in your answer.arrow_forwardSleep apnea is a condition in which the sufferers stop breathing momentarily while they are asleep. This condition results in lack of sleep and extreme fatigue during waking hours. A current estimate is that 12.8million out of the 312.7 million Americans suffer from sleep apnea, or approximately 4.1%. A safety commission is concerned about the percentage of commercial truck drivers who suffer from sleep apnea. They do not have any reason to believe that it would be higher or lower than the population’s percentage. To test the claim that the percentage of commercial truck drivers who suffer from sleep apnea is not 4.1%, a simple random sample of 392 commercial truck drivers is examined by a medical expert, who concludes that 24 suffer from sleep apnea. Does this evidence support the claim that the percentage of commercial truck drivers who suffer from sleep apnea is not 4.1%? Use a 0.02 level of significance. Step 1 of 3 : State the null and alternative hypotheses for the test.…arrow_forwardThe manufacturer of an MP3 player wanted to know whether a 10% reduction in price is enough to increase the sales of its product. To investigate, the owner randomly selected eight outlets and sold the MP3 player at the reduced price. At seven randomly selected outlets, the MP3 player was sold at the regular price. Reported below is the number of units sold last month at the regular and reduced prices at the randomly selected outlets. Regular price 134 125 86 111 118 129 97 Reduced price 129 136 152 134 115 127 133 133 At the 0.010 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales? Hint: For the calculations, assume reduced price as the first sample. Compute the pooled estimate of the variance. (Round your answer to 3 decimal places.) Compute the test statistic. (Round your answer to 2 decimal places.) State your decision about the null hypothesis.arrow_forward
- Big Ideas Math A Bridge To Success Algebra 1: Stu...AlgebraISBN:9781680331141Author:HOUGHTON MIFFLIN HARCOURTPublisher:Houghton Mifflin Harcourt