2. Statistics that describe the dispersion among scores in a distribution aremeasures ofа.statistic.b.parameter.variation.с.d.central tendency.

Answered: Statistics that describe the dispersion…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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I. Background The Food and Drug Administration (FDA) tries to find out whether there is a relation between the number of years people smoked and the percentage of lung damage. FDA asks you for your help to find it out. You interviewed twenty people who have smoked and obtained the following data. II. Technical report: a) Draw a scatter plot. b) Based on the scatter plot, explain whether the number of years and the percentage of lung damage are correlated. If they are correlated, discuss the strength of correlation, and the direction (positive or negative). c) Find the correlation coefficient r. Explain what r implies. d) Choose your own significance level a (1 suggests 0.1, 0.05 or 0.01). State and test the hypothesis. Explain what your findings mean. e) Do your observations in part (b) agree to the results from part (c) and (d)? Explain f) Find the regression line equation. Explain what the line implies. g) Draw the regression line on your scatter plot. h) A man has…
Use table for questions 1a, b,c, Number of hours spent sleeping at night 5 8 6 7 4 9 8 7 5 9 8 10 7 7 8 6 8 8 7 8 9 8 7 5 9 10 7 8 8 6 1a. Find the measurer of central tendency for the data. Mean: Median: Mode: 1b. Which measure of central tendency so you think gives the best indication of the number of hours the “typical” person spends sleeping each night? Explain 1c. Suppose anotherperson was surveyed who said that he spends 3 hours sleeping at night. How would this affect the mean, median and mode? 2A. Use the given data set to solve the following problems 100, 129,105,97,112,103,241,110,117,18. Find the a) mean b) median c) mode B) What effect dose removing the outlier have on each measure of central tendency? a) mean b) Mode c) Median 3. Gray has taken an aptitude test 8 times and his scores are 96,98,105,36,87,95, and 93. Which measure of central tendency is most appropriate for his score?
The figure below shows relative frequency histogram for 50 employees working in a small construction company classified according to their years of experience. While x-axis represents the class midpoints of experience years, y-axis represents relative frequency for the employees. The value of variance for the years of :experience is between Relative Frequency for Employees 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 7.5 Relative Frequency Chart 13.5 19.5 Class Midpoints of Experience Years 25.5 32-34 O 40-42 O 12-14 O 20-22 O 52-54 O
The correlation coefficient (r) measures O how many data points are shown on a scatterplot. O whether or not a scatterplot shows an interesting pattern. O whether a cause and effect relationship exists between two variables. O the strength and direction of the linear relationship between two quantitative variables.
Students in a statistics class took their first test. The following are the scores they earned. Fill in the stem-and-leaf plot below use the tens place as the stem and the ones place as the leaf. Describe the shape of the distribution. 73 84 95 91 98 97 90 74 74 82 63 79 82 88 74 88 67 81 83 69 73 95 91 94 86 56 94 62 a) Data were collected for variable(s). Is it appropriate to make a stem-and-leaf plot for this type of data and number of variables? . b) Complete the stem-and-leaf plot below. You must put commas between the leaves. Stems Leaves 5 c) What shape is the stem-and-leaf plot above?
Explain what a box and whisker plot is and how we use it to understand central tendency and variability.
Determine whether the data is from a primary or secondary source. Primary Secondary
Which set of variables has correlation and causation? A. distance traveled and money spent on gas B. distance traveled and money spent on snacks C. distance traveled and number of drinks consumed D. distance traveled and time spent listening to music
Give three real-world examples of an theoretical distribution of data.
The table lists weights (pounds) and highway mileage amounts (mpg) for seven automobiles. Use the sample data to construct a scatterplot Use the first variable for the x-axis. Based on the scatterplot, what do you conclude about a linear correlation? 2425 Weight (Ib) Highway (mpg) 2725 2875 3480 4070 4090 3125 34 33 30 25 24 36 31 Which scatterplot below shows the data? O A. OB. C. O D. 40- 40- 40 20+ 2000 20- 2000 Weight (Ib) 20어 2000 20- 2000 Weight (Ib) 5000 5000 5000 5000 Weight (Ib) Weight (Ib) Is there a linear relationship between weight and highway mileage? O A. No, there appears to be no relationship. O B. Yes, as the weight increases the highway mileage increases. O C. No, there appears to be a relationship, but it is not linear. Click to select your answer. 4:21 PM a 17 梦 * v 6/4/2021 W 0 門 e Type here to search Chp ins prt sc delet fg ho ト f8 144 f6 10 f5 f4 IOI esc back & #3 $4 4 T. 6, 00 %24 (6 d) AamH 3. (B dw) Am
d. Estimate the blood pressure of the student if his stress test score is 80, 60, and 85.
Which scatter plot shown has the strongest negative correlation?

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Statistics that describe the dispersion among scores in a distribution are measures of a. statistic. b. parameter. с. variation. d. central tendency.