which one is X variable and Y variable?Variable DescriptionIndexSalesConsumer Confidence IndexChange in retail sales (in percentage)

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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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ASSESSMENT: Find the Mean, Median and Mode of the grouped data. Show your solution 1. Lower Cumulative Scores Frequency Boundaries Class Mark fx frequency (cf) (ib) (x). 1-4 5-8 9-12 13 - 16 8. 17-20 21-24 10 25-28 N =
For each of the variables described below, indicate whether it is a quantitative or a categorical (qualitative) variable. Also, indicate the level of measurement for the variable: nominal, ordinal, interval, or ratio. Make sure your responses are the most specific possible. Variable Type of variable Level of measurement (a)Duration (in minutes) of a call to a customer support line Quantitative Categorical Nominal Ordinal Interval Ratio (b)Exchange on which a stock is traded (NYSE, AMEX, or other) Quantitative Categorical Nominal Ordinal Interval Ratio (c)Temperature (in degrees Celsius) Quantitative Categorical Nominal Ordinal Interval Ratio
PLEASE PROVIDE TYPED ANSWER What is the total number and percent of people who take antipsychotics? A total number of study population is .?Among them, the percent of men with depression was a slightly (higher/lower) than the percent of women with depression.
Answer for these match the correct answer
Using the example research hypothesis below, please give an example of either an independent or dependent variable [just one] that you could measure at the nominal, ordinal, and ratio level. Please give an example of each level of measure for that one variable. Be sure to include the question and the response categories. Example Hypothesis: Among Sexual Minority Young Adults, there is a Significant Difference in how many days of the last 30 a participant reports poor mental health based on whether they are white or black. Nominal: Ordinal: Ratio Level:
describe the correlation between the two variables
6.Please read and complete currently this is a review.
Tablet computers In October 2011, cnet.com listed thebattery life (in hours) and luminous intensity (i.e., screenbrightness, in cd>m2 ) for a sample of tablet computers.We want to know if brighter screens drain the batterymore quickly.Dependent variable is Video battery life (in hours)R-squared = 27.9%s = 1.913 with 23 - 2 = 21 degrees of freedomVariable Coefficient SE(Coeff) t-Ratio P-ValueIntercept 2.8467073 1.6628386 1.7119566 0.10163Brightness 0.014080549 0.0049373503 2.851843 0.00955a) How many tablet computers were tested?b) Are the conditions for inference satisfied? Explain.c) Is there evidence of an association between maximumbrightness of the screen and battery life? Test anappropriate hypothesis and state your conclusion.d) Is the association strong? Explain.e) What is the equation of the regression line?f) Create a 90% confidence interval for the slope of thetrue line.g) Interpret your interval in this context.
ZOOM + 2. Researchers studying acid rain recorded the pH level for a sample of 26 water sources in Pennsylvania. The sorted list of the data (some values have been obscured), the histogram of the data, and some other statistics are below. Histogram of pH levels Sort (pH) Frequency 10 10- 4.12 4.12 ?? ?? 4.29 ?? 4.31 4.39 4.39 4.40 4.41 4.45 4.52 4.56 4.57 4.60 ?? ?? 4.73 ?? 5.08 5.29 5.51 5.62 5.67 5.78 Summary statistics: Col n Min Max Q1 pH Q3 26 4.12 5.78 4.31 4.82 a) Find the median pH level. Carefully show your work. b) Considering your answer to part a) and the histogram, which would be the best choice for the sample mean pH level (4.68, 4.56, or 4.00 units)? Explain. c) Find the Range of the pH levels. d) Find the IQR of the pH levels 1 pH 3. The following numbers are a sample of ten of my golf scores from 2020. In golf the “units" are technically called "strokes". Find my mean score and the standard deviation of my scores. 98, 94, 88, 90, 86, 92, 86, 85, 84, 87
Agricultural companies like to predict how much they can grow per acre based on annual rainfall in inches. Let's assume that an ag company wants to predict indigo yields based on rainfall. What is the response variable? rainfall the ag company indigo yield variety of indigo
What type if variable is color vision status categorical or quantitative
Please do not give solution in image format thanku

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which one is X variable and Y variable? Variable Description Index Sales Consumer Confidence Index Change in retail sales (in percentage)