TOPIC 8 Chi-Square goodness-of-fit test Problem 12.1 Use a chi-square goodness-of-fit to determine whether the observed frequencies are distributed the same as the expected frequencies (α = .05) Category | fo | fe | 1 | 53 | 68 | 2 | 37 | 42 | 3 | 32 | 33 | 4 | 28 | 22 | 5 | 18 | 10 | 6 | 15 | 8 | Step 1 Ho: The observed frequencies are distributed the same as the expected frequencies Ha: The observed frequencies are not distributed the same as the expected frequencies Step 2 df = k – m – 1 Step 3 α = 0.05 x 2 0.05, 5df = 11.0705 Step 4 Reject Ho if x 2 > 11.0705 Category | fo | fe | | 1 | 53 | 68 | | 2 | 37 | 42 | | 3 | 32 | 33 | | 4 | 28 | 22 | | 5 | 18 | 10 | | 6 | 15 | 8
2.12 b. 1.734 c. -1.740 d. 1.740 ANSWER: d -same process but now go to one tailed α=0.05 and dof = 17 4. Read the t statistic from the table of t distributions and circle the correct answer. A one-tailed test (lower tail), a sample size of 10 at a .10 level of significance; t = a. 1.383 b.
STAT 533 COURSE PROJECT – PART C Using MINITAB perform the regression and correlation analysis for the data on CREDIT BALANCE (Y) and SIZE (X) by answering the following. 1. Generate a scatterplot for CREDIT BALANCE vs. SIZE, including the graph of the ‘best fit’ line. Interpret.
Quiz 2 1- When two events A and B are independent the intersection of the events can be found by multiplying the probabilities of the individual events. (5 pts) True 2- Based on a 15 observations shown below, determine the Q25%, median, Q75% and the mean. Based on your analyses, which direction the data is skewed (i.e. right or left or neither)? (5 pts) 25, 18, 32, 19, 42, 14, 36, 48, 30, 25, 18, 44, 51, 28, 36, 27, 39, 16 14, 16, 18, 18, 19, 25, 25, 27, 28, 30, 32, 36, 36, 39, 42, 44, 48, 51=548 Median = 29 28+30=58/2=29 Mean = 30.44 548/18=30.44 Q25= 20.50 Q75= 38.25 Skewed to the right 3-The following box plot is based on a recent study on daily charges for a hospital semiprivate room in Louisiana.
Test Case 2: Inputs 1 Expected output: You chose South Korean Won Result: You chose 1 Solution: Add Nesting structure for each of the five currencies Test Case 3: Inputs 6 Expected Output: A display message Result: Blank screen Solution: Add Write “Thank You” Test Case 4: Inputs Malaysian Ringgit Expected Result: Your selection is not valid, please make a valid selection Result: System crash Solution: ElseIf NOT currencyType >=1 OR <=6 AND !=integer Then GetIntValue Test Case 1: Input -1 Expected Result: “Currency is not valid, please enter a valid number” Result: “Currency is not valid, please enter a valid number” Test Case 2: Input 874,000.12 Expected Result: “You entered 874,000.12 Result: “Currency is not valid, please enter a valid number” Solution: Display "Enter a currency value (positive number, for example 1000000.00):" Test Case 3: Input 1200300.00 Expected Result: “Currency is not valid, please enter a valid number” Result: “Currency is not valid, please enter a valid number” Test Case 4: Input 500.00 Expected Result: You entered 500.00 Result: You entered 500.00 ConvertCurrency Test Case 1: Input 1 Expected Result: continue to DisplayResults
For what values of t will the null hypothesis not be rejected? a) To the left of -1.645 or to the right of 1.645 b) To the left of -1.345 or to the right of 1.345 c) Between -1.761 and 1.761 d) To the left of -1.282 or to the right of 1.282 QNT 561 Final Questions and Answers QNT 561 Final Exam 2. Which of the following is a characteristic of the F distribution? a) Normally distributed b) Negatively skewed c) Equal to the t-distribution d) Positively skewed 3. For a chi-square test involving a contingency table, suppose the null hypothesis is rejected.
For what values of t will the null hypothesis not be rejected? a) To the left of -1.645 or to the right of 1.645 b) To the left of -1.345 or to the right of 1.345 c) Between -1.761 and 1.761 d) To the left of -1.282 or to the right of 1.282 2. Which of the following is a characteristic of the F distribution? a) Normally distributed b) Negatively skewed c) Equal to the t-distribution d) Positively skewed Complete Answers here QNT 561 Final Exam 3. For a chi-square test involving a contingency table, suppose the null hypothesis is rejected.
Anyways video games are probably the best stress reliever for me even though basketball may be my favorite because it's like you can be in that alternate reality when you play them. You can just be a hero for 30 minutes out of your day and it makes you feel good. Plus indie games like Minecraft are just a laid back open world game where you can explore and relax, play at your own pace. I would and do use all of these In times of stress but if I had to pick one it would be computer games. You can easily blow of some steam in a video game,
1) “Very satisfied” customers give the XYZ-Box video game system a rating that is at least 42. Suppose that the manufacturer of the XYZ-Box wishes to use the random sample of 65 satisfaction ratings to provide evidence supporting the claim that the mean composite satisfaction rating for the XYZ-Box exceeds 42. a. Letting μ represent the mean composite satisfaction rating for the XYZ-Box, set up the null and alternative hypotheses needed if we wish to attempt to provide evidence supporting the claim that μ exceeds 42. H0: μ≤42 H1: μ>42 b. In the context of this situation, interpret making a Type I error; interpret making a Type II error.
Descriptive Statistics Overpriced MyTab (H1) Central Tendency: Mean = 46.80 Dispersion: Standard Deviation = 11.86 per age group Number: 400 Min/Max: 27/58 Confidence Interval: (z) 36.40-57.20 Competitor has Better Products (H2) Central Tendency: Mean=33.20 Dispersion: Standard Deviation = 8.84 Number: 400 Min/Max: 21/45 Confidence Interval: (z) 25.45-40.95 Descriptive Statistics Interpretation Overpriced MyTab (H1) 400 participants were randomly selected to complete a survey that asks yes or no questions. They were divided into 5 categories depending on their age (18-45). The data was normally distributed as shown by the p-value of .05. There is a 95% confidence that there are 36.40-57.20 persons in each age group that responded that they believe the MyTab is overpriced. Competitor has better product (if applicable) This data was also normally distributed.