Which measure of central location is meaningful when the data are nominal? A. The mode B. The geometric mean C. The median D. The arithmetic mean A perfect straight line sloping downward would produce a correlation coefficient equal to: A. +1 В. -1 C. +2 D. -2
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- c. Identify the feature of the data that would be missed if part (b) was completed without constructing the scatterplot. Choose the correct answer below. O A. The scatterplot reveals a distinct pattern that is not a straight-line pattern. O B. The scatterplot reveals a distinct pattern that is a straight-line pattern with negative slope. O C. The scatterplot reveals a distinct pattern that is a straight-line pattern with positive slope. O D. The scatterplot does not reveal a distinct pattern. Using the linear correlation coefficient found in the previous step, determine whether there is sufficient evidence to support the claim of a linear correlation between the two variables. Choose the correct answer below. O A. There is insufficient evidence to support the claim of a nonlinear correlation between the two variables O B. There is insufficient evidence to support the claim of a linear correlation between the two variables O C. There is sufficient evidence to support the claim of a…Use a stem-and-leaf plot to display the data, which represent the numbers of hours 24 nurses work per week. Describe any patterns. 40 42 48 32 40 30 23 40 36 40 Key: 313=33 Hours worked 2 3 4 5 Determine the leaves in the stem-and-leaf plot below. 50 32 36 40 35 38 49 What best describes the data? 40 36 36 40 33 40 32 OA. Most nurses work over 40 hours per week. OB. Most nurses work under 40 hours per week. OC. Most nurses work between 40 and 50 hours per week, inclusive. OD. Most nurses work between 30 and 40 hours per week, inclusive.Construct a stem-and-leaf plot for the data. Stock prices (rounded to the nearest dollar). 29 63 34 91 74 25 66 74 85 51 53 69 79 60 52 56 38 72 43 35 ..... Select the correct choice below and fill in the answer boxes to complete your choice. O A. В. Stem Leaf Stem Leaf Stem Leaf 2 2 1 3 3 2 4 4 (blank) 3 5 4 (blank) 6 6 7 6 7 8. (blank) 8 9 (blank) 8. 9 Units: 2|9 = $29 Units: 219 = $29 9 |(blank) Units: 2|9 = $29
- These are the times, in seconds, that 15 members of an athletics club took to run 800 metres. 139 148 151 140 162 182 154 171 157 142 145 178 132 148 166 (i) Draw a stem-and-leaf diagram of the data. (ii) Find the median, the upper and lower quartiles and the interquartile range. (iii) Draw a box-and-whisker plot of the data.An economist want to determine the relation between one’s FICO score, x, and the interest rate of a 36-month auto loan, y. The given data represent the interest rate (in percent) a bank would offer on a 36-month auto load for various FICO scores. Credit Score;x Interest Rate (percent);y 545 18.982 595 17.967 640 12.218 675 8.612 705 6.68 750 5.15 Find the least-squares regression line treating the FICO score as the explanatory variable and the interest rate as the response variable. Predict the interest rate a person would pay if their FICO score were the median score of 723.An engineer wants to determine how the weight of a car, x, affects gas mileage, y. The following data represent the weights of various cars and their miles per gallon. C Car Weight (pounds), x Miles per Gallon, y 2630 3095 3305 3655 4150 25.7 24.5 22 22 15.4 (a) Find the least-squares regression line treating weight as the explanatory variable and miles per gallon as the response variable. Write the equation for the least-squares regression line. (Round the x coefficient to five decimal places as needed. Round the constant to one decimal place as needed.) (b) Interpret the slope and intercept, if appropriate. Choose the best interpretation for the' slope. O A. The slope indicates the mean change in miles per gallon for an increase of 1 pound in weight. O B. The slope indicates the mean weight. OC. The slope indicates the mean miles per gallon. O D. The slope indicates the ratio between the ean weight and the mean miles per gallon. hp
- Use a stem-and-leaf plot to display the data, which represent the numbers of hours 24 nurses work per week. Describe any patterns. 40 40 44 48 35 40 36 58 32 36 40 35 D 30 28 36 40 36 40 33 40 32 38 29 Determine the leaves in the stem-and-leaf plot below. Key: 3|3 = 33 Hours worked 2 4 What best describes the data? O A. Most nurses work under 40 hours per week. O B. Most nurses work over 40 hours per week. O C. Most nurses work between 40 and 50 hours per week, inclusive. O D. Most nurses work between 30 and 40 hours per week, inclusive. 40 3.A researcher measures the relationship between education (in years) and investment gains (in thousands of dollars). Answer the following questions based on the results provided. SP = 16.25. a. Create a scatter plot of the data & Calculate r and r2b. Report results in APA style & What do results mean? Education Investment Gains 14 8 12 11 9 10 18 14A property analyst is examining the relationship between the City Council's valuation on residential property and the market value (selling price) of the properties. A random sample of 8 recent property transactions were examined. The data is recorded in the tables below. Find the intercept (rounded off to four decimals). 1 2 3 4 5 6 7 8 A. 0.0892 B. -4.0293 OC. 6.7128 D. 1.285 City Council valuation (R1000) 12 45 32 50 28 56 18 40 Market value (R1000) 65 220 142 310 196 364 116 260 SSxy=10319.875 SSY = 70990.875 Exy=69084 b = 6.1912 SSX 1666.875 x = 34.4286 y=209.125
- Mr. K. as a BIG family! At a recent family gathering he recorded which grades his cousins' kids are in. Here is the raw data: 2, 11, 10, 11, 7, 6, 12, 5, 9, 4, 7, 2 Record the... Min: Q1: Median: Q3: IQ Range: Маx: Range: Then MAKE a Box-and-Whisker plot of the data. 4 6. 8 9 10 11 12 13L4Q2.Which one of the following scatter plots best describes the given data?Consider this set of data: 4.5 3.2 3.5 3.9 3.5 3.9 4.3 4.8 3.6 3.3 4.3 4.2 3.9 3.7 4.3 4.4 3.4 4.2 4.4 4.0 3.6 3.5 3.9 4.0 Construct a stem and leaf plot by using the leading digit as the stem. Construct a stem and leaf plot by using each leading digit twice. Does this technique improve the presentation of the data? Explain.
