The sample mean was 407 and the sample standard devia... A dance instructor is interested in whether the music tempo affects dance performance. Obviously, research questions may be asked for many reasons. 3. Be sure each hypothesis is in the proper "If…, then" format. Consider the following hypothesis test with n = 19, s = 6.2, and \bar{x} = 62.3. The athletic direc... For testing the effectiveness of a drug, 900 subjects receive an oral administration of the drug in question. 4 - 5 ... To provide an example of hypothesis development, let’s … Two tail test, z = 2.30, alpha = 0.... A hypothesis is an assumption or a best guess that A. becomes a selection factor in research. Identify the dependent and independent variable for each. Find and interpre... Do runners have low heart rates, on average? 5. The null hypothesis is a claim about a .... A. population parameter, where the claim is assumed to be true until it is declared false. Suppose that we want to carry out a hypothesis test for this cl... A toy manufacturer claims that the mean time that its top-selling toy captures children's attention is at least 30 minutes. Doing so yields: 110 116 124 132 168 This sample is of size 5, and odd number, so the middle value of 124 is the sample median. For each question, write an appropriate hypothesis that could be tested with an experiment. The report concluded that half of all college students binge drink. Claim: mu greater than 130... A humane society claims that less than 38% of U.S. households own a dog. The sample mean is 30, and the population standard deviation is 4. The dean of students would like to see if there is a significant difference in the ages of resident students and commuter students. The mean SAT score in mathematics is 513. Identify the null and alternative hypotheses, test statistic, critical value(s) or P-value, conclusion about the... A cereal company claims that the mean weight of the cereal in its packets is 14 oz. The manager hopes the new system will reduce waiting times from the current 9... one research study of illegal drug use among 12-17 years old reported a decrease in use (from 11.4% in 1997) to 9.7% now. A significance test for comparing two means gave t=−1.97 with 10 degrees of freedom. What type of hypothesis test should she use? B) Ask an issue, evaluate results, create a hypothesis, test the hypothesis, draw conclusions, communicate results. In a survey of 1000 new college graduates 250 had a professional job on graduation day. Saved by Docstoc. Suppose that the f... A presidential candidate claims that the proportion of college students who are registered to vote in the upcoming election is at least 69%. Given the following data, what kind of test (left, right, two-tailed) should be used? At a certain university, the average attendance at basketball games has been 3025. Use a 0.01 significance level to test the claim that the probability that the home team wins is greater than one-... A nutritionist wants to determine whether people who regularly drink one protein shake per day have different cholesterol levels than people in general. Is there sufficient evidence to conclude that the mean number of calories for lite beers is signi... Fortune reports that $125,000 is the mean year-end employee bonus at Wall Street securities firms. The s... An educator claims that the average salary of substitute teachers in New York is at most $100 per day. Identify the Type I or Type II error for the test. Use Excel's 2-sample variances data analysis tool to solve the following problem. A commonly cited standard for one-way length (duration ) of school bus rides for elementary school children is 30 minutes. A medical researcher found in a sample of 45 women who had a normal... A graduate student believes that people consider faces with more contrast between eye color and skin tone as more feminine. H_{0}: p \geq 0.76 H_{A}: p less than 0.76 a. In a sample of 420 randomly selected reservations, 19 were no-shows. research question. On the basis of her newly developed technique, a student believes she can reduce the amount of time schizophrenics spend in an institution. Within each pair of children, one... Students at Penn State College of Engineering and Eberly College of Science have debates on who is smarter. Hypothesis: If soda is added to the water and tablet, then the dissolving rate will be First note that this is a claim about a population PROPORTION. c. State that neither the normal nor the t distribution applies. A real estate broker believes that the mean price has increased then. We use alpha/2 as the comparison with our p-value. When testing the drug, what are the null and alternative hypotheses? State whether the standardized test statistic t indicates that you should reject the null hypothesis. Clearly, some questions are too trivial and meaningless to bother answering. This sample had a standard deviation of 0.25. Big Shoulders Insurance Company took a random sample of 50 insurance claims paid out during the last year and found that the mean was $1500 and the standard deviation was $120. H_{0}: \mu = 61 H_{A}: \mu \neq 61 \alpha = 0.10 a. In the following examples, indicate whether you would perform a t-test of independent means or dependent means. $1.25. 0the amount of water affects plant growth, then if a plant is watered everyday it will grow In a pre-election poll, a candidate for district attorney receives 356 of 700 votes. n = 56, x bar = 77.04, s = 6.80. | |Experimental group|Control group |Sample size| 35|5... At the time she was hired as a server at the Grumney Family Restaurant, Beth Brigden was told, "You can average $83 a day in tips." The delivery time (in business days) for international parcel by post for a random sample of 26 parcels are. A teacher believes that students with natural music abilities are more likely to be left-handed than typical students are. A sampl... A sample of 65 observations is selected from one population with a population standard deviation of 0.75. Assume that the samples are independent and that they have been randomly selected. sure each hypothesis is in the proper "If…, then" format. Full Document. The production manager at Bellevue, a manufacturer of wheelchairs, wants to compare the number of defective wheelchairs produced on the day shift with the number on the afternoon shift. This can be thought of as a hypothesis with the following hypotheses. a. It also mentions that the level of significance (alpha) is .05 for a two-tail test. 5. solution rate. Use a t-test to test the claim about the population mean mu at the given level of significance alpha using the given sample statistics. State the null and alternate hypotheses. 109 Pars made from alloy 1 and 48 parts made from alloy 2 were subjected to stress tests. The Rocky Mountain district sales manager of Rath Publishing Inc., a college textbook publishing company claims that the sales representatives make an average of 39 sales calls per week on professo... A United Nations report shows the mean family income for Mexican migrants to the United States is $27,300 per year. 94. State the decision rule in terms of the critical value of the te... For the hypotheses below, test \alpha = 0.025 with n = 100 and \bar{p} = 0.65. In a study conducted recently, researchers discovered that in a sample of 28 elderly men the sample standard deviation of serum ferritin was 52... Why is hypothesis testing important, and how could I incorporate hypothesis testing in the healthcare field? 2. For each problem or question write a hypothesis, underline the independent variable once, and the dependent variable twice. Hypothesis Practice Worksheet Date:_____! The principal of a middle school claims that the test scores of the seventh-graders at his school vary less than the best scores of the seventh-graders at a neighboring school, which have a variati... A researcher claims that the amount of acetaminophen in a certain brand of cold tablets have a standard deviation difference from sigma = 3.3 mg claimed by the manufacturer. Question: Copy the question that you have selected from page 1. The cheetah (Acinonyx jubatus) is the fastest land mammal and is highly specialized to run down prey. First note that this is a claim about a population PROPORTION. Suppose we want to carry out a hypothesis test to see if the mean height when these plants are treated with a certain chemical differs... A long distance telephone company claims that the mean duration of long-distance telephone calls originating in one town was greater than 9.4 minutes, which is the average for the state. b. Which type of alternative hypothesis is used in the figure below? the water the faster the tablet dissolves. Automotive engineers investigated the effect of a particular additive on fuel economy of automobiles by computing the mean miles per gallon of five vehicles operated normally on fuel with the addit... A researcher wants to check the claim that convicted burglars spend an average of 18.7 months in jail. appropriate hypothesis that could be tested with an experiment. In a random sample of 600 memory cards, it is found that 3% are defective, but the supplier claims that th... An annual survey of first-year college students asks 280,000 students about their attitudes on a variety of subjects. 5. A is the correct answer. 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