A project has estimated optimistic (a), most likely (m) and pessimistic (b) times for activity D as 7, 8 and 14 days, respectively. What is the mean AND variance for activity D, respectively (to 1 decimal place): Select one: a. 8.8 and 1.2 b. 8.5 and 0.7 C. 8.8 and 0.7 d. 9.7 and 1.4
Q: number 4
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- J11.What technique compares dispersion with the average of data? Select one: a. Standard deviation b. Process capability c. Variance d. Coefficient of variationRefer 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?
- What is the zscore for: data= 31 mean =39 Sx= 3.7 O 2.16 O -2.16 О 3.7 O -3.7X is a point estimator of: Select one: a. Population mean b. Sample mean c. Sample variance d. Population varianceA cruise ship charges passengers $3 for a can of soda. Because of passenger complaints, the ship manager has decided to try out a plan with a lower price. He thinks that with a lower price, more cans will be sold, which would mean that the ship would still make a reasonable total profit. With the old pricing, the mean number of cans sold per passenger for a 10-day trip was 10.3 cans. Suppose μ represents the mean number of cans per passenger for the new pricing. What hypotheses should the ship manager test if he wants to determine if the mean number of cans sold is greater for the new pricing plan? O Ho: μ = 10.3 versus H₂: μ> 10.3 O Ho: μ = O Ho: μ = 10 versus Ha: μ 10.3
- The Department of Motor Vehicles office tried a new customer service system after people complained they were wasting too much time waiting in line. Use the two relative frequency histograms to answer the following questions. Waiting Times at the DMV (OLD SYSTEM) Waiting Times at the DMV (NEW SYSTEM) 50- 50 40 40- 30 30 20 10 0 0 5 10 15 20 25 30 0 5 10 20 25 30 Time Waited OLD (in minutes) 15 Time Waited (in minutes) Comparing the median and the mean for the new system we see that The mean is smaller than the median. The mean is larger than the median. The mean is almost exactly the same as the median. Percent 20 10 0 PercentWhat is the variance of X in the following data? 2. Select one: 17.5 none 17.5/6 1.70The mean price of computers is OMR 214.6 and coefficient of variation (CV.) is (18.6 %), then the variance is approximately: Select one: 1593.26 39.92 141.728 221.924
- An article reported on a long-term study of the effects of hurricanes on tropical streams of a forest. The study shows that a hurricane had a significant impact on stream water chemistry. The following shows a sample of 10 ammonia fluxes in the first year after the hurricane. Data are in kilograms per hectare per year. Complete parts (a) through (c) below. 99 85 147 147 177 116 57 57 89 156 D a. Find the mean. The mean is. (Type an integer or decimal rounded to one decimal place as needed.) b. Find the median. The median is (Type an integer or decimal rounded to one decimal place as needed.) c. Find the mode(s). Select the correct choice below and, if necessary, fill in the answer box within your choice. O A. The mode(s) is(are) (Use a comma o separate answers as needed.) O B. There is no mode.In California, we need more rain to sustain the health of our natural environment, argriculture, and economic. A group of statistics students in Oxnard College recorded the amount of rain during 2016-2017 school year, measuring the intensity by the inches of rain, and the results were: Inches of Rain 1 2 3 4 5 6 Frequency 1 2 8 2 1 1 The mean (¯xx¯) rain intensity: inches (Please show your answer to 1 decimal place.)The median rain intensity: inchesThe mode rain intensity: inches (Please separate your answers by ',' in the bimodal situation. Enter DNE if there is no mode or if there are more than two modes.)I. Find: Solve the following ungrouped data. x-x (x-x)² 3 7 10 11 17 19 21 23 25 a. Mean b. Variance c. Standard Deviation d. Measure of Position D4 P45 Q3 D9 P85