STATS 401 Study Guide - Midterm Guide: Interpolation, Normal Distribution, Order Statistic

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turquoisegnu128

15 Oct 2018

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Use the 2001 average daily maximum temperature data for question 5 in this problem set. You should provide your code (if any) and the numerical answer to each question, along with any written explanation that is requested: suppose you observe the data 1, 3, 5, 2, 3, c, c. 2 + (c 2)2/6 + ( c 2)2/6, which can in turn be simpli ed to s. This is an increasing function of |c|: suppose we observe data x1, x2, . Express your answer in terms of the order statistics. Solution: x(15) x(5): generate ve iid samples of size 100 from a standard normal distribution. Solution: i got values of 0. 36 for sample size 100, and 0. 04 for sample size 1000, based on this code: Since the population median of the standard normal distribution is 0, | q(0. 5)| is a measure of how far the sample median lies from the population median.

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I need help conducting a z-test for my assignment. The question states, "You want to determine if Canadians are nicer (less rude) than Americans. Americans 'niceness' score is µ=2.4 with a standard deviation of 1.6. You get a sample of n=36 Canadians to complete the same niceness questionnaire. You calculate descriptive statistics for your sample as M=2.9 and s=1.9. As this is exploratory research, use an alpha of .10. Conduct a z-test on the information above. Make sure to note: 1.) the formula, 2.) the null and alternative hypothesis, 3.) the critical value, 4.) calculate the result (show calculation in case of error), 5.) What is the statistical decision, 6.) What does this mean in plain english?"

Thanks for the help!

yellowimpala697

Multiple Choice

1. You have a large dataset that will print on several pages. You want to ensure that related records print on the same page with column and row labels visible and that confidential information is not printed. You should apply all of the following page setup options except which one to accomplish this task?

(a) Set a print area.

(b) Print titles.

(d) Change the print page order.

2. You are working with a large worksheet. Your row headings are in column A. Which command(s) should be used to see the row headings and the distant information in columns X, Y, and 2?

(a) Freeze Panes command

(b) Hide Rows command

(d) Split Rows command

3. Which statement is not a recommended guideline for designing and creating an Excel table?

(a) Avoid naming two fields with the same name.

(b) Ensure that no blank columns separate data columns within the table.

(c)-Leave one blank row between records in the table.

(d) Include field names on the first row of the table.

4. Which of the following characters are wildcards in Excel? (Check all that apply.)

(a) *

(b) #

(e) ?

(d) $

5. What should you do to ensure that records in a table are unique?

(a) Do nothing; a logical reason probably exist to keep identical records.

(b) Use the remove duplicates command.

(d) Find the duplicate records and change some of the data to be different

6. Which Conditional Formatting rule is best suited to apply formatting to the top five values in a range of values?

(a) Above Average

(b) Greater Than

(c). Top 10 Items

(d) Between

7. Which date filter option enables you to restrict the view to only dates that occur in March of 2018?

(a) Equals

(b) Before

(d) Between

8. Which of the following is an unqualified structured reference?

(a) =[Purchase_Price]-[Down Payment]

(b) =Sales[Purchase_Price]-Sales[Down_Payment]

(d) =[Sales]Purchase_Price [Sales]Down_Payment

9. Which of the following is not an aggregate function that can be applied in a total row?

(a) MAX

(b) AVERAGE

(d) VLOOKUP

10. If you would like to set a conditional formatting rule based on the function=AND(G6"Finance". H7<7000), which formatting rule type is needed?

(a) Format all cells based on their values

(b) Format only cells that contain

(d) Format only values that are above or below average

burgundycoyote150

Opeele Kyinkafa sells different used 2005 GM cars in excellent condition. The value or the retail price (Price) of a car is dependent on a variety of characteristics such as number of miles the car has been driven (Mileage), manufacturer of the car (Make) such as Buick, Cadillac, Chevrolet, Pontiac, SAAB, and Saturn. The car price is also influenced by the body type (Type) such as sedan, convertible, coupe, hatchback and wagon. It is also affected by number of cylinders (Cylinders) in the engine, the engine size (Liter), cruise control which is an indicator variable representing whether the car has cruise control (yes) or no otherwise and Sound indicator representing whether the car has upgraded speakers (yes) or no otherwise. All cars in this data set were less than one year old when priced and considered to be in excellent condition. Determine which major variables are dummies and are dynamic? Identify 3 potential unobserved heterogenous factors in this dataset. Display the full descriptive statistics of the data in R. Why do you think some variables are starred (*)? What is the median for “price”, standard deviation for “mileage”, skewness for “cylinder” and mean for “sound”? Test if “price” is normally distributed using histogram, kernel density plot and the shapiro wilk test. Create a red scatterplot matrix of price, mileage, cylinder, liter, make. From your graph, is the correlation between price & mileage positive or negative? What’s the pearson correlation coefficient between price & mileage and between “cylinder” & “liter” correct to 2 d.p Create a correlation matrix of the dataset by finding the apt R command for converting all string/dummy variables From the matrix, identify 2 potentially good predictors? Identify 3 pairs of variables that are mostly multicollinear. Which 2 pairs of variables are least correlated? Identify 3 pairs of variables most highly correlated with Cylinder Generate a simple regression plot of price on mileage with a re fitted line. Run the whole multiple regression model (label the equation as "regprice") & use it to answer the other questions. Specify the regression model for the whole data keeping the exact names of the variables. Write the estimated regression equation. In one sentence, which variables are significant and which are not? Justify Is the regression model justifiable? Explain Interpret the coefficient of Mileage, MakeCadillac, TypeSedan, Cylinder, & Cruiseyes. Compare the price of a car with 130,000 mileage, 6 cylinders, 3.8 liters, with cruise and sound, was manufactured by Pontiac with a convertible body type with that of the price of a car with four cylinders, 120,000 mileage, 3.8 liters, without cruise nor sound, was manufactured by Cadillac with a hatchback body type. Which factor(s) appears to be causing a comparative difference (if any)? Using only the VIF, which one of the pairs of variables selected to be multicollinear may be deleted? Justify?

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STATS 401 Study Guide - Midterm Guide: Interpolation, Normal Distribution, Order Statistic

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