In Exercises 5–20, assume that the two samples are independent simple random samples selected from
20. Blanking Out on Tests Many students have had the unpleasant experience of panicking on a test because the first question was exceptionally difficult. The arrangement of test items was studied for its effect on anxiety. The following scores are measures of “debilitating test anxiety.” which most of us call panic or blanking out (based on data from “Item Arrangement, Cognitive Entry Characteristics. Sex and Test Anxiety as Predictors of Achievement in Examination Performance,” by Klimko, Journal of Experimental Education, Vol. 52, No. 4.) Is there sufficient evidence to support the claim that the two populations of scores have different means? Is there sufficient evidence to support the claim that the arrangement of the test items has an effect on the score? Is the conclusion affected by whether the significance level is 0.05 or 0.01?
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Essentials of Statistics (6th Edition)
- II. Conduct a hypothesis test A research center claims that less than 50% of senior high school students in public schools in the Philippines have accessed the Internet using cellular phones. In a random sample of 100 SHS students, 39% say they have accessed the Internet using cellular phones. At = 0.01, is there enough evidence to support the researcher's claim?arrow_forwardThe question that I need help with is attached. thanksarrow_forwardScientists conducting a study on global climate change want to determine if there has been an increase in the number of days per year that the temperature in El Paso rises above 100 degrees Fahrenheit. In 1981, there were 21 days where the temperature rose above 100 degrees Fahrenheit. The scientists want to know whether the average number of days per year that the temperature rises above 100 degrees Fahrenheit has increased. Which hypothesis test would be most appropriate for this study? O One mean (sigma known) - one sample z O One mean (sigma unknown) - one sample t O Mean of differences, using dependent samples (paired data) O Difference of two means (independent samples) O Several means (ANOVA) O One proportion O Difference of two proportions O Chi-Squared test for independencearrow_forward
- Suppose data shows that only 50% of breast cancer patients can survive more than 5 years. You suspect the percentage is too low, so you'd like to conduct a study to examine this situation. What is the null and alternative hypothesis in this situation?arrow_forwardNow consider a bag of ten colorful marbles. You reach into the bag 100 times. Each time you pull out a marble, write down what color it was, then put it back in the bag and do it again. You record the following data: Table describing marble frequency Color Frequency Red 22 Yellow 9 Green 41 Blue 28arrow_forwardAn article published in the Washington Post claims that 45 percent of all Americans have brown eyes. A random sample of ?=78n=78 college students students found 30 who had brown eyes.Consider testing ?0:?=.45H0:p=.45??:?≠.45 (b) P-value = ?arrow_forward
- A researcher wants to find the effect of a special diet on systolic blood pressure. A sample of 7 adults was selected to start them on this diet for 3 months. Based on this information, can it be stated that systolic blood pressure changes with the special diet? The test statistic that will determine whether systolic blood pressure changes with the special diet is...... A. 1.23 B. 0.48 C. 18.1 D. 21.08 E. 4.08arrow_forwardIt has been found that 24.8% of men (Group 1) 20 years and older suffer from hypertension (high blood pressure) and 34% of women (Group 2) are hypertensive. A random sample of 168 of each gender was selected from recent hospital records, and the following results were obtained. Can you conclude that a higher percentage of women have high blood pressure? Use =0.05. Men: 42 patients had high blood pressure Women: 53 patients had high blood pressure Required: Test Value Only the final answer should be rounded-off to TWO decimal places.arrow_forwardPart 2 of 3 (b) Assume that a histogram for the sample is bell-shaped. Between what two values will approximately 68% of the sample be? Approximately 68% of the sample values will fall between andarrow_forward
- Find the value of the test statistic z using graphing calculator.The claim is that the proportion of people with blood type A-positive is more than 0.25, and the sample statistics include n = 616 randomly selected people and 185 of them with blood type A-positive.arrow_forwardA recent study claims that 40% of registered voters associate themselves with Democrats. 35% with Republicans, 20% Independent, 3% Green party, and 2% with Social democrats. In a sample of 400 individuals, we observed Actual 200 Democrats 150 Republicans 25 Independent 15 Green Party 10 Social Democrats Test the claim at a=0.05.arrow_forwardDetermine the hypothesis using apa formatarrow_forward
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