B. A researcher working with elderly people is interested in whether memory decreaseswith age. An independent groups experiment is conducted with three age groups, 30-39,40-49, and 50-59. Two memory tasks are given, a difficult, long passage to be memorizedand a relatively easy, shorter passage. Subjects are randomly assigned, four to each cell.Scores are percent correct, with 100 being a perfect score. The data are shown here:Age (years)40-49Memory Task30-3950-59908885Easy959793929691948991808477756766Difficult827979746971 1. Independent variables?2. Dependent variable?3. Explain the design.4. Experimental hypotheses in symbols?5. Which statistical analysis should be used and why?6. Statistical statements? Which are significant?

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MATLAB: An Introduction with Applications

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Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

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Explain, in nontechnical terms, the concepts of statistical significance and Type I and Type II error. Type I Error: Rejecting the null hypothesis when it is in fact a correct hypothesis. Type II Error: Failing to reject the null hypothesis when it is in fact an incorrect hypothesis.
3
Hypothesis testing for a population proportion pi. I need your help to remember how to identify the parameter, null hypothesis, alternative hypothesis, test statistic, rejection rejion or p-value, and conclusion in word problems. For example... 1. Identify the parameter and set up null and alternative hypotheses. a. A researcher wants to establish more than 20% Minnesota residents do not have health insurance. b. A vending machine says there is at least 12 oz dispensed per coffee cup. I want to prove the machine is defective. c. A pollster wants to prove Mr. Joe Smith will lose the November election.
7. An introductory stats professor hypothesizes that 50% of students learn best by watching the videos, 10% by reading the book, 20% by solving questions, and the rest from the discussion forums. She surveys a random sample of a large sample of students asking them how they learn best, and wants to use these data to evaluate her hypothesis. Which method should she use? hypothesis test for a single mean ANOVA O x test of independence O x test of goodness of fit F-test t-test Z-test
What are the variables, what scale of measurement is each variable (nominal,ordinal,or continuous). Then state the null and alternative hypothesis in words.
A large retail company conducted a manual inspection of the price scanning at checkout. In particular, they want to know if there is any relationship between scanning error rates and sale pricing practices. Here are the data they obtained Undercharged 22 Overcharged 14 Correct price 201 Test the claim at an a = 0.05 significance level. Round all values to 3 decimal places. • Fill in the expected values: State the hypotheses: O Ho: x² = 0 H₁: x² 0 O Ho: x² = 0 H₁X² / 0 OF V Undercharged Overcharged Regular Advertised Price Sale Price Correct price Regular Price 8 31 229 Advertised Sale Price
Question: Is the women’s slope significantly different from zero? Use a 1% significance levelfor your tests. Write out all four steps of the hypothesis testing process and include a sentenceinterpreting your results. Is the men’s slope significantly different from zero? Use a 1% significance level foryour tests. Write out all four steps of the hypothesis testing process and include a sentenceinterpreting your results.
29. The General Social Survey polled 1280 men and 1531 women to determine their level of education. The results are presented in the following table. Can you conclude that education level is independent of gender? Use ? = 0.01 level of significance. No High School Diploma High School Diploma Associate’s Degree Bachelor’s Degree Graduate Degree Men 178 608 96 248 150 Women 186 827 128 259 131 (a) State the hypotheses. (b) State the test statistic. (c) Calculate the P-value. (d) Make a decision. (e) State the conclusion addressing the original claim.
I only need question 2 answered. Question 1’s are only there for reference.
1. What type of statistical analysis should you use to test this? A)Single sample z-test. B) Single sample t-test C) Independent samples t-test D) Independent samples t-test 2. Explain why 3. What is the dependent variable 4. What is the independent variable?

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1. Independent variables? 2. Dependent variable? 3. Explain the design. 4. Experimental hypotheses in symbols? 5. Which statistical analysis should be used and why?