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- b. The compensation received by the highest-paid executives of 12 international companies (in $'000) is as follows: 801 820 2215 803 850 856 899 846 902 856 911 947 i. Find the mean and the median compensation of the executives. Comment on the skewness of the distribution of the executives' compensations. 2For problems 23 and 24, refer to the following: A chemical engineer wanting to study the evaporation rates of water from brine evaporation beds obtained the following data on the number of centimeters of evaporation in each of 19 days in July: 8.6 9.9 9.8 9.4 9.1 11.5 8.0 10.4 10.2 11.1 8.3 8.7 8.4 11.9 9.9 9.1 23. How many observations fall above the 7 decile? (Use the manual method.) 10.5 8.3 10.7 A. 2 В. 3 С.4 D. 5 24. What is the value of the first quartile? (Use the manual method.) B. 8.6 C. 10.4 D. 11.1 A. 8.3 25. It is a user interface that adds a more user-friendly and streamlined working environment C. RStudio A. Rtools B. Console pane D. Script pane 26. This is a tab in RStudio that shows all objects that are loaded or generated during the current session. C. History D. Viewer A. Files B. Environment 27. Consider a data set of 11 distinct measurements with mean equal to A and median equal to B. If the highest value was decreased to a value smaller than the median B, how would…1. The attorney for the Food and Drug Administration claims that a Pharmaceutical Company makes cold caplets that contain amounts of acetaminophen with a mean different from the 650mg amount indicated on the label. а. Claim: b. Ho: Hạ: с. Analysis: d. Tail of the distribution: 2. The instructor claims that her student's mean score for the Final Term Examination is not lower than 50. а. Claim: b. Ho: Ha: с. Analysis: d. Tail of the distribution: 3. The effectiveness of Prilosec for treating heartburn is tested by measuring gastric acid secretion in patients before and after the drug treatment. Test if there is a decrease after in the gastric acid secretion after the drug treatment. a. Claim: b. Ho: H3: с. Analysis: d. Tail of the distribution: PSYCH 2104 Exer4|1
- These next questions come after part B. Which of the statements correctly describes the relationship between the mean and median in the histogram of the number of servings of fruit per day claimed by the 7474 seventeen‑year‑old girls? A) The mean and median are about equal because the distribution is right‑skewed. B) The mean is larger than the median because the distribution is right‑skewed. C) The median is larger than the mean because the distribution is right‑skewed. D) There is not enough information to tell us about the relationship between the mean and median in the histogram. (c) In general, you cannot find the exact values of median, quartiles, or mean from the histogram. What is special about the histogram of the number of servings of fruit that allows you to do this? Select an answer choice. A) We know exactly how many observations fall in each bin because of the way the bins are constructed. B) The sample size only consists of only 74…. A process that cuts lengths of metal with high precision has historically produced metal rods with length that is normally distributed and with a mean of 800 millimetres (mm). Management at the factory is concerned that after an overhaul of the machine the mean length of the rods being produced could differ from the required 800 mm. If it is found that the rods are not being produced to specifications then the machine will have to be stopped for readjustment, with a consequent loss of production. The production line manager tasked with investigating the issue finds that a (random) sample of 25 rods yielded a mean length of 806 mm and a sample standard deviation of 10 mm. i. The mean of the sample is clearly not the required 800 mm. Say why this is not enough information in itself to say if the machine is operating correctly or not. ii. State the null and alternative hypotheses for this situation.3. The fill volume of an automated filling machine used for filling cans of carbonated beverage isnormally distributed. Suppose that the mean of the filling operation can be adjusted easily, but thestandard deviation remains at 0.4 fluid ounce.a. At what value should the mean be set so that 99.9% of all cans exceed 12 fluid ounces?b. At what value should the mean be set so that 99.9% of all cans exceed 12 fluid ounces if thestandard deviation can be reduced to 0.09 fluid ounce?
- 1.) Suppose that a teacher wants to see if a new teaching method improves test scores in their class. Luckily, they also know that the average score of all students in the United States in that grade is 85 and the sd is 10. Given that their class of 25 students’ (the sample) Mean score is 90... What is the standard error? 1 2 1.5 2.5 ----------------------------------------- 2.) Calculate the standardized effect size for question 1. What can you say about this effect size? It is a small effect size It is a moderate effect size It is a large effect size Cannot calculate the standardized effect size with the information given. ------------------------------------------------------------------------------------- 3.) Students have taken an exam. The mean was 70 and the standard deviation was 2. A student who scored 72, scored better than: 84% 30% 20% 99%…16. The shows the number of observations with values smaller than the upper class boundary. A. greater than cumulative frequency C. frequency distribution B. less than cumulative frequency D. class markAverage monthly wages (per employee) in 4 sectors of an economy are as follows: industry: 2000 dinars, building: 2200 dinars, agriculture: 1500 dinars, services: 1800 dinars. Number of people employed in the four sectors are 5 million, 2 million, 6 million, and 2 million, respectively. Using the concept of harmonic mean compute the average monthly wages in the economy under consideration.
- 10. A random sample of nine telephone calls in an office provided the following information. Duration Call Number (In Minutes) Туре of Call 1 local 8 long distance 3 4 local 4 3 local 5 5 long distance local 3 local 8 5 local 8 local (a) Determine the point estimate for the average duration of all calls. (b) Determine the standard error of the mean. (c) What is the point estimate for the proportion of all calls that were long distance? (d) Determine the standard error of the proportion. 3. 6 73. If the mean of 5 observations is 2, and the deviations of these observations about their mean are: 0, -3, -3, 5, 1. Then the median is equal to: *Q3. Which of these does not constitute a descriptive statistic? A. `A table of raw data in a spreadsheet. B. A cross-tabulation of the data. C. A Bar Graph. D. A line graph О А. А О В. В С. С O D. D