1. The mean weight of 150 students in a certain class is 60 kilograms. The mean weight of boys in the class is 70 kilogram and that of the girls is 55 kilograms. Find the number of boys and number of girls in the class.
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- A mining company finds that daily lost-work injuries averages to 1.2. If the local union contract has a clause requiring that the mine be shut down as soon as three workers incur lost-work injuries, on what percentage of the days will the mine be operational throughout the day?Suppose the price per share of stock for a sample of 25 companies was recorded at the beginning of the first financial quarter and then again at the end of the first financial quarter. How stocks perform during the first financial quarter is an indicator of what is ahead for the stock market and the economy. Company End of 1st quarter Beginning of 1st quarter Company 1 54.69 55.32 Company 2 56.20 78.52 Company 3 103.07 110.50 Company 4 80.45 85.08 Company 5 126.51 140.73 Company 6 133.23 137.28 Company 7 32.56 42.57 Company 8 51.41 54.54 Company 9 35.90 37.94 Company 10 14.55 19.48 Company 11 33.04 40.04 Company 12 45.33 40.36 Company 13 185.13 189.53 Company 14 109.28 109.45 Company 15 72.46 92.15 Company 16 49.32 55.03 Company 17 36.70 43.73 Company 18 79.57 86.18 Company 19 95.50 87.45 Company 20 43.09 47.09 Company 21 51.32 66.70 Company 22 77.45 86.53 Company 23 46.77 45.99 Company 24 46.45 48.13 Company 25 130.36 129.08 (a)…9- we know the population mean for turnover intentions is μ = 2.00. Is the mean for our current sample of employees significantly different from the population mean? Use an α = .01.
- Find out the next month after april income by using the forecasting method of the moving average method1. What does calculating the Bendford's average tell us about Individuals? 2. What can we learn by looking at an individual's transactions using the lens of Bendford's law?A sample containing years to maturity and yield for 40 corporate bonds are contained in the data given below. Years to Maturity Yield Years to Maturity Yield 27.75 6.075 5.00 6.888 10.50 5.966 10.50 3.477 18.50 4.444 8.00 2.893 13.50 5.569 18.50 4.945 2.75 7.673 5.50 1.991 10.00 6.969 26.50 1.320 13.50 2.956 21.25 1.867 2.75 2.241 13.25 2.189 24.25 0.916 11.75 7.499 1.75 5.323 25.75 5.686 10.25 1.720 13.50 5.195 16.75 3.987 20.00 1.710 22.50 6.405 27.00 1.121 21.25 4.456 1.25 4.146 23.75 2.725 6.25 7.115 8.75 5.497 5.25 1.211 27.75 6.392 4.50 5.998 24.00 0.989 9.00 2.458 15.00 6.169 8.00 1.162 29.00 5.105 8.75 4.978 a. What is the sample mean years to maturity for corporate bonds and what is the sample standard deviation? Mean (to 4 decimals) Standard deviation (to 4 decimals) b. Develop a 95%…
- 3. The following statements indicates the use of descriptive statistics EXCEPT A. Last school year, the ages of students at Poytechnic University of the Philippines are from 16 to 21 years old.B. A car manufacturer wishes to estimate the average lifetime of batteries by testing a sample of 50 batteries.C. A basketball player wants to know his average score for the past 10 games.D. Based on the data of NTC, the number of subscribers increased by 30% from 2015 to 2016.The owner of a cell phone store at Greenhill’s Shopping Center was not happy when he learned that the average number of cell phones sold daily was only 8 mobile phones. He hired a new seller and told him to tally the daily sales for 20 days. The following are the number of cell phones sold for the past 20 days. 9 9 9 8 9 9 11 12 12 16 10 12 8 11 17 18 15 14 17 14 Do the collected data present sufficient evidence to indicate that the average number of cell phones sold daily has increased? Use 0.05 level of significance. Assume normality in the population.Table 217 of the 2006 U.S. Statistical Abstract shows that, among all 25–34 year olds, the average annual earnings of a high school graduate with no further education was $26,073 while the average annual earnings of a college graduate with no further education was $43,794 in 2003. a. Assuming college requires five years, show that the annual return to each year of college education averages 10.9 percent. b. It is typically thought that this type of calculation of the returns to schooling is biased because it doesn’t take into account innate ability (i.e., ability in the workplace not due to college) or innate motivation. If this criticism is true, is the actual return to each year of a college education more than or less than 10.9 percent?
- (Feb 21—27) Projected Actual Difference Food Cost $6,971 $7,842 +$871 (over) Beverage Cost $3,954 $4, 156 +$202 (over) Labor Cost $8,423 $9,541 +$1,118 (over) Other Costs $7,645 $7,645 $0 (even) Total Costs $26,993 $29, 184 +$2191 (over) Food Sales $18,565 $14,326 -$4,239 (under) Beverage Sales $12,872 $10,852 -$2,020 (under) Total Sales (Revenue) $31,437 $25,178 -$6,259 (under) Total Profit $4,444 -$4,006 -$8,450 (under) Based on the actual results, what adjustments need to be made to Food and Beverage sales projections for next week? a. Projections for next week should be set the same as this week, so we can strive to reach our goals. b. Projections for next week should be increased because we exceeded our projections this week c. Because this week's actual profit (-$4006) came in below our projected profit ($4444), we should reduce next week's Food and Beverage sales…1)In a cross-tabulation or contingency table examining the relationship between breed of dog and whether the dog passed certification to become a service animal, it is found that, overrall, 62 percent of the dogs were certified. The data looked at this for 6 breeds of dogs. If breed and being certified are independent of each other, about what percentage of each breed would pass the test? 2)Which of the following features must be present in a research design if the researchers want their data to demonstrate a causal relationship? The cause must take place before the effect. To the extent possible, another variable that explains the relationship needs to be ruled out or accounted for. The two variables need to covary. These three features must all be present. O A and B A correlation coefficient r provides two pieces of information about a relationship between two variables. These are Strength; direction of relationship Direction, proportionsThe Australian Security Exchange (ASX) has more than 2000 listed companies as of 2020. The following table shows the average annual returns of the top ten companies. Company Average Annual Return (%) Archer Daniels Midland 10.5 American Airlines 7.1 Coca-Cola 10.6 Exxon Mobil Corp 13.3 General Electronic 12.6 Intel Corporation 22.8 Merck & Co 11.2 Procter & Gamble 12.8 Walmart Stores 9.7 Wendy's International 10.3 a) Calculate the mean annual return of the above ten companies. b) List out the companies that are below the 40th Percentile (L40) c) What is the standard error of this sample if the standard deviation of the population is 4.17?