A developmental psychologist would like to determine how much fine motor skill improves for children from age 3 to age 4. She takes a random sample of 9 three-year old children and a second sample of 9 four-year old children and measures fine motor skill in each using a manual dexterity test that measures fine motor skill. Higher scores on this test indicate better fine motor skills. Her data are: Three Year Olds: 35, 36, 39, 29, 35, 34, 33, 34, 35 Four Year Olds: 40, 35, 38, 39, 40, 50, 40, 38, 42 Is there a significant difference in the motor skills from age three to four? Test with an α = 0.01. What type of error is possible based on the outcome? Calculate and interpret the effect size. Report the mean motor skill score for each of the samples. On average, which group had the better fine motor skills?

A researcher is interested in examining whether people experience greater traumatic stress after a natural disaster (hurricane) or a man-made tragedy (terrorist attack). The researcher measured the stress of 10 people who experienced a hurricane and 10 people who experienced a terrorist attack. Stress was measured on a scale from 1-5, with higher scores indicating greater stress. Enter their data (see below) into SPSS and answer the following questions.   Hurricane Terrorist Attack 3.6 3.0 2.2 3.2 3.6 4.7 2.4 4.7 2.2 4.4 1.0 4.2 1.7 2.0 2.2 3.6 2.7 4.6 1.7 4.4   Run an independent t-test ?

A researcher conducts a study to investigate whether the obesity rate rural communities differ from the obesity rate from the population at large. He gathered a sample of adults from a small community, measured their weight, and compared it to the population average. What statistical test is appropriate for this study and why?

Most universities and colleges require an SAT score as one of the inputs to an admissions decision. Is it a good predictor of college success? Total SAT scores for 10 students are given, along with their college GPAs. SAT GPA 1070 3.50 1040 2.66 1120 3.54 1020 3.00 1260 3.41 1100 3.80 SAT GPA 960 2.00 990 1.66 1060 3.30 1010 2.50 Compute the correlation coefficient, ?, for SAT scores and GPAs using a calculator or software. ?=0.698 ?=−3.3 ?=0.49

The Bureau of Labor Statistics reports that the official unemployment rate for Black people was 10.4% and 4.7% for White people in February 2015. Select all correct answers for this question. O The samples of white and black people are independent. The explanatory variable is the unemployment rate. The response variable is the unemployment rate. The response variable is race.

A randomly sampled group of patients at a major U.S. regional hospital became part of a nutrition study on dietary habits. Part of the study consisted of a 50-question survey asking about types of foods consumed. Each question was scored on a scale from one (most unhealthy behavior) to five (most healthy behavior). The answers were summed and averaged. The population of interest is the patients at the regional hospital. A prior survey of patients had found the mean score for the population of patients to be μ=2.9 After careful review of these data, the hospital nutritionist decided that patients could benefit from nutrition education. The current survey was implemented after patients were subjected to this education, and it produced the following sample statistics for the 15 patients sampled: x¯=3.5 and s=1.2 We would like to know if the education improved nutrition behavior. We test the hypotheses H0:μ=2.9 versus Ha:μ>2.9. The tt test to be used has the test statistic:   Answer:

A researcher gathered a sample of participants who volunteered for a studying of phobias. She measured anxiety level of participants as they viewed photos of spiders and again when they viewed puppies. Which statistical test is appropriate for this study and why?

The city council is considering a law that would ban smoking in all public facilities. A sample has been selected from the community and tested for support of the ordinance. Is there a statistically significant relationship between age and support for the anti-smoking law? Use the five step model as a guide and write a sentence or two interpreting your results.                        Age   Less than 40 More than 40   Support:       For 145   78 223   Against 103 169 272     248 247 495

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According to data from the Tobacco Institute Testing Laboratory, a certain brand of cigarette contains an average of 1.4 milligrams of nicotine. An advocacy group questions this figure, and commissions an independent test to see if the the mean nicotine content is higher than the industry laboratory claims. The test involved randomly selecting n = 15 cigarettes, measuring the nicotine content (in milligrams) of each cigarette. The data is given below: 1.8, 1.8, 1.5, 1.1, 1.4, 1.3, 1.3, 1.4, 1.1, 1.3, 1.6, 1.2, 1.8, 1.4, 1.6; Download .csv file Not sure how to perform some of the tasks with R-Studio? Click to learn more (a) Do the data follow an approximately Normal distribution? Use alpha = 0.05. yes (b) Determine the P-value for this Normality test, to at least three decimal places. P (c) Choose the correct statistical hypotheses. O A. Ho: > 1.4, O B. Ho = 1.4, O C. Ho X = 1.4, O D. Ho: X = 1.4, ⒸE. Ho - 1.4 HA: > 1.4 OF. Ho: X > 1.4, HA: X < 1.4 HA: < 1.4 HA: 1.4 HA: X 1.4 HA: X <…