Solving a word problem

0 Question 20 v B 0/1 pt 0 3 8 99 G) Details On a recent quiz, the class mean was 69 with a standard deviation of 4.2. Calculate the z-score (to 4 decimal places) for a person who received score of 70.68. Is this unusual? 0 Unusual O Not Unusual Question Help: 8 Message instructor Submit Question 0 Question 17 v 80/1 pt '0 3 8 99 (D Details Find the 5 number summary for the 15 data values shown in the table below. Use the locator/ percentile method described in the book. Observe that the data has been sorted for you in increasing order from left-to-right and then top-to-bottom in the table below. If any cells at the end of the table are blank, then just ignore them (i.e. any blank cells are intentional). 5 number summary: Question Help: 8 Message instructor Submit Question Question 19 0/1 pt 5 3 99 0 Details Find the five-number summary for the following set of data. Data 4 4 6 10 12 14 16 17 19 21 Min = Q1 = Q2 = Q3 = Max Question Help: Message instructor Submit Question0 Question 6 v l3 0/1 pt '0 3 8 99 G) Details The maintenance department at the main campus of a large state university receives daily requests to replace fluorecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 56 and a standard deviation of 5. Using the 68-95-99.7 rule, what is the approximate percentage of lightbulb replacement requests numbering between 56 and 66? Do not enter the percent symbol. Question Help: El Video 1 IE] Video 2 8 Message instructor Submit Question 0 Question 5 v E 0/1 pt '0 3 8 99 (9 Details A sample of size n = 10 is drawn from a population. The data is shown below. 115.8 112.2 97.6 101.5 134.5 121.8 134.5 108.8 117 134.5 What is the range of this data set? What is the standard deviation of this data set? (Remember, it is a sample.) Please report the answer with appropriate rounding, reporting 2 more decimal places than the original data. Please, please, please do not calculate the value by hand. Question Help: El Message instructor Submit Question 0 Question 8 v l3 0/1 pt '0 3 8 99 (9 Details In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell- shaped and has a mean of 39 and a standard deviation of 9. Using the empirical rule, what is the approximate percentage of daily phone calls numbering between 12 and 66? Do not enter the percent symbol. Question Help: 8 Message instructor Submit Question 0 Question 7 v 80/1 pt '0 3 8 99 G) Details A sample of size n = 10 is drawn from a population. The data is shown below. 136.9 117.8 112.8 101.4 136.9 109.2 99.9 136.9 124.7 118.8 What is the range of this data set? What is the standard deviation of this data set? (Remember, it is a sample.) Please report the answer with appropriate rounding, reporting 2 more decimal places than the original data. Question Help: 8 Message instructor Submit Question 0 Question 11 v l3 011 pt 0 3 8 99 G) Details At two years of age, the lengths of sardines have an approximately bell-shaped and symmetric distribution with a mean of 20.3 cm and a standard deviation of 0.6 cm. 1. The middle 68% of sardines have a length between ( 2. The middle 95% of sardines have a length between ( [3 SW 3. The middle 99. 7% of sardines have a length between ( C], [3) cm Question Help: 8 Message instructor Submit Question 0 Question 9 v E4 0/1 pt '0 3 8 99 (D Details The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have a mean of 48 ounces and a standard deviation of 7 ounces. Use the Empirical Rule and a sketch of the normal distribution in order to answer these questions. a) 68% of the widget weights lie between [: b) What percentage of the widget weights lie between 34 and c) What percentage of the widget weights lie below 69 ? Question Help: El Video 8 Message instructor Submit Question 0 Question 2 v B 0/1 pt '0 3 8 99 (9 Details An experiment was conducted to measure the effectiveness of various feed supplements on the growth rate of chickens. A five number summary of the weights of the chicks in grams six weeks after hatching is as follows. Source: Anonymous (1948) Biometrika, 35, 214. Min = 115 Q1 = 192 Median = 263 Q3 = 324 Max = 415 1. About 192. 2. About 263. 3. About 324. 4. About and 324. percent of the chicks weigh more than percent of the chicks weigh more than percent of the chicks weigh more than percent of the chicks weigh between 192 DUDE 0 Question 15 v B 0/1 pt 0 3 8 99 0 Details The results of a common standardized test used in psychology research is designed so that the population mean is 160 and the standard deviation is 30. A subject earns a score of 127. What is the z-score for this raw score? Question Help: El Video El Message instructor Submit Question 0 Question 3 v E 0/1 pt '0 3 8 99 0 Details On a recent quiz, the class mean was 73 with a standard deviation of 2. Calculate the z-score (to at least 2 decimal places) for a person who received score of 77. Is this unusual? 0 Unusual 0 Not Unusual Question Help: 8 Message instructor Submit Question 0 Question 16 v B 0/1 pt 0 3 8 99 G) Details Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8 inches. Find the height of a man with a z-score of 0.1 (to 2 decimal places) l: Question Help: El Video 8 Message instructor Submit Question 0 Question 13 v B 0/1 pt 0 3 8 99 0 Details Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8 inches. Find the z-score of a man 63.1 inches tall. (to 2 decimal places) :] Question Help: 8 Message instructor Submit Question 0 Question 14 v E 0/1 pt '0 3 8 99 0 Details On a recent quiz, the class mean was 75 with a standard deviation of 4. Calculate the z-score (to 2 decimal places) for a person who received score of 89. Is this unusual? 0 Unusual 0 Not Unusual Question Help: El Video 8 Message instructor Submit Question Question 12 E 0/1 pt 0 3 8 99 (9 Details The boxplots below shows salaries for Construction workers and Teachers. Construction Teacher -l||lllI- 20 25 30 35 40 45 50 Salary (thousands of$) Q Jennie makes the minimum salary for a construction worker. Markos makes the third quartile salary for a teacher. Who makes more money? O Markos O Jennie (Note that the boxplots are labeled in thousands of dollars. For example, 30 means $30,000. If the difference appears to be $5, it is actually $5000. If this were the correct answer, you could enter it as either 5000 or 5,000) Question Help: Video 8 Message instructor Submit Question o @ 0 Question 10 v E 0/1 pt '0 3 8 99 G) Details The heights of women have a symmetric distribution with a mean of 64 inches and a standard deviation of 2.8 inches. 1. Approximately 68% of women have heights between (l:], l:]> inches. 2. Approximately 95% of women have heights between (S, S) inches. 3. Approximately 99.7% of women have heights between (C, Cl Question Help: 8 Message instructor Submit Question Question 1 0/1 pt 9 3 99 0 Details Calculate the standard deviation and variance of the sample data shown, to two decimal places X 18.9 3.4 12.1 28.9 18.3 21.4 Standard deviation: Variance: Question Help: Video Message instructor Submit Question0 Question 18 v E 0/1 pt '0 3 8 99 0 Details The scores on a standardized test are normally distributed with a mean of 85 and standard deviation of 10. What test score is 0.9 standard deviations above the mean? :] Question Help: Video 8 Message instructor Submit