Select any of the following scenarios where data should be collected throughan observational study and not an experiment.Select 2 correct answer(s)A pharmaceutical company wishes to determine if a new medication will beeffective for treating inflammation.Your neighborhood's HOA wishes to determine the average number of childrenper household in the neighborhood.A local shelter wishes to determine the percentage of animals that are adoptedwithin two weeks of arriving at the shelter.You wish to determine if playing music to your plants will help them grow.

The four scenarios where data are collected.The data collection is either through an observational…

Answered: Select any of the following scenarios…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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A local doctor office recorded the wait time for 70 patients on a Saturday afternoon and organized the times in the histogram below
Suppose you want to estimate the percentage of videos on YouTube that are cat videos. It is impossible for you to watch all videos on YouTube so you use a random video picker to select 1000 videos for you. You find that 2% of these videos are cat videos. A. What is the sample? B. Label each of the following as an observational unit, a variable, a statistic, or a parameter i. Percentage of all videos on YouTube that are cat videos. ii. 2% iii. A video in your sample. iv. The proportion of videos in your sample that are cat videos.
The British Department of Transportation studied to see if people avoid driving on Friday the 13th. They did a traffic count on a Friday and then again on a Friday the 13th at the same two locations. The data for each location on the two different dates is in the table. Do the data show that on average fewer people drive on Friday the 13th? Test at the 10% level. Traffic Count 6th 13th 1990, July 138998 138877 1990, July 135438 136187 1991, September 132918 129920 1991, September 136810 133914 1991, December 124545 120192 1991, December 128339 125776 1992, March 122024 118128 1992, March 124013 120800 1992, November 136759 134911 1992, November 123410 122447 Dates State the null and alternative hypotheses. Ho: Hd ? ✓ Ha: Hd ? ✓ Calculate the test statistic. Round to four decimal places. d= Calculate the standardized test statistic. Round three decimal places. t = Find the p-value. Round to four decimal places. p-value = State your decision. O Since the p-value is greater than .10,…
Ensure that you utilize the five-step model and show all your work when addressing the question. Does the rate of voter turnout vary significantly by the type of election? A random sample of voting precincts displays the following pattern of voter turnout by election type. Assess the results for significance. Local Only State National 33 35 42 78 56 40 32 35 52 28 40 66 10 45 78 12 42 62 61 65 57 28 62 75 29 25 72 45 47 51 44 52 69 41 55 59 Note: let “X” represents x-bar or x̅. let M represent μ
Consider a sample with data values of 29, 27, 22, 17, 32, 38, 30, and 27. Compute the 20th, 25th, 65th, and 75th percentiles. Step 1 Recall that a percentile gives insight to how data are spread between the smallest and largest values. The pth percentile of a set of data indicates that p% of the data are below that value, and (100 − p)% are above that value. There are two components of the pth percentile: the location within the data and the actual value. The formula for finding the location of the percentile, denoted Lp, follows where p is the percentile and n is the number of observations in the ordered data set. Lp = p 100 (n + 1) The first step in calculating a percentile is to order the data in ascending order. The ordered data are below. 17 22 27 27 29 30 32 38 There are n = 8 observations in the data. Find the location of the p = 20th percentile. Lp = p 100 (n + 1) L20 = 20 100 + 1 =
= ✓ D A local bank wants to study waiting times of customers. A sample of four customers is selected on successive days, and the time is measured from the point each customer enters the line to when he or she reaches the teller window. The results are shown in the data table. a. Construct a control chart for x. b. Is the process within statistical control? Click the icon to view the data. Click the icon to view a table of control chart factors. a. Construct a control chart for x. Choose the correct graph below. O A. 10- mw Sample b. Select the correct choice. Q LCL 20 3 4 5 6 7 8 9 10 Table of Control Chart Factors Table 14-2 Control Chart Constants R Chart n: Number of Observations in Subgroup 2 D₂ 0.000 0.000 0.000 2.282 0.000 2.114 0.000 2.004 0.076 0.136 0.184 0.223 B. D₂ 3.267 2.574 10- 1.924 1.864 1.816 1.777 Print Sample A. No, because there is at least one point lying outside of the region between the upper and lower control limits. x Chart A₂ 1.880 1.023 0.729 0.577 0.483…
Question 2. Crescent Oil has developed three new blends of gasoline and must decide which blend or blends to produce and distribute. A study of the miles per gallon ratings of the three blends is being conducted to determine if the mean ratings are the same for the three blends. Five automobiles have been tested using each of the three gasoline blends and the miles per gallon ratings; Automobile (Block) 12345 2 4 5 Type of Gasoline (Treatment) Blend X Blend Y Blend Z 31 30 29 33 26 30 29 29 31 25 29.8 30 29 28 Treatment Means a. Compute the analysis of variance for the randomized block design 28.8 29 26 28.4 Block Means 30.333 29.333 28.667 31.000 25.667
Bottles of purified water are assumed to contain 250 milliliters of water. There is some variation from bottle to bottle because the filling machine is not perfectly precise. Usually, the distribution of the contents is approximately Normal. An inspector measures the contents of eight randomly selected bottles from one day of production. The results are 249.3, 250.2, 251.0, 248.4, 249.7, 247.3, 249.4, and 251.5 milliliters. Do these data provide convincing evidence at α = 0.05 that the mean amount of water in all the bottles filled that day differs from the target value of 250 milliliters?
A company produces scooters used by small businesses that find them convenient for making short deliveries. The company is notified whenever a scooter breaks down, and the problem is classified as being either mechanical or electrical. The company then matches the scooter to the plant where it was assembled. The data table to the right contains a random sample of 200 breakdowns. Use the data file and the relative frequency assessment method to complete parts a through c. Electrical Mechanical Total Plant 1 21 52 73 Plant 2 63 64 127 Total 84 116 200 a. What is the probability a scooter was assembled at Plant 1? P(Plant 1) =O (Type an integer or a decimal.) b. What is the probability that a scooter breakdown was due to an electrical problem? P(electrical) = (Type an integer or a decimal.) c. What is the probability that a scooter breakdown was due to a mechanical problem and the scooter was assembled at Plant 1? P(mechanical and Plant 1) = (Type an integer or a decimal.)
The Economist collects data each year on the price of a Big Mac in various countries around the world. The price of a Big Mac for a sample of McDonalds restaurants in Europe in May 2009 resulted in the following Big Mac prices (after conversion to U.S. dollars):3.80 5.89 4.92 3.88 2.65 5.57 6.39 3.24The mean price of a Big Mac in the U.S. in May 2009 was $3.57. For purposes of this exercise, assume it is reasonable to regard the sample as representative of European McDonalds restaurants. Does the sample provide convincing evidence that the mean May 2009 price of a Big Mac in Europe is greater than the reported U.S. price? Test the relevant hypotheses using a = .05. Assume a normal distribution of the data. x = Ho: μ = Ha: Select an answer α= P-value = |: S= Based on the above we choose Question Help: Post to foru Submit Question (Put in the correct symbol and value) ✓ Select an answer Reject the null hypothesis Fail to reject the null hypothesis
Does it seem to you that people tend to be absent more on some days of the week than on others? Recently, a major biotechnology firm collected data with the hope of determining whether or not its employees were more likely to be absent (due to personal reasons or illness) on some weekdays than on others. The firm examined a random sample of 150 employee absences. The distribution of these 150 absences is shown in the table below. The observed frequency for each category (each weekday) is shown in the first row of numbers. The second row of numbers contains the frequencies expected for a sample of 150 employees if employee absences at the firm are equally likely on each of the five weekdays. The bottom row of numbers contains the following value for each of the categories.
Four scenarios of statistical studies are given below. Decide which study uses a population parameter. Answer O Lakeside Family Dentistry reported that 6 of the 15 patients who came in for a regular cleaning one day had at least one cavity. O As part of her senior project, Kaisa asked 84 of her classmates if they voted in the last presidential election. 39 said yes. O of 351 dog owners who were surveyed, 70 reported owning two dogs. The average finish time for the Ironman, Kona was 11:32 for the 1883 finishers, with an average swim time of 1:14, an average bike time time of 4:14.

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