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Study Resources (Statistics)

Determine whether the samples are independent or dependent. 21) The effectiveness of a headache medicine is tested by measuring the intensity of a headache in patients before and after drug treatment. The data consist of before and after intensities for each patient. A) Independent samples B) Dependent samples Use the traditional method to.
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Perform the indicated goodness-of-fit test. 1) Among the four northwestern states, Washington has 51% of the total population, Oregon has 30%, Idaho has 11%, and Montana has 8%. A market researcher selects a sample of 1000 subjects, with 450 in Washington, 340 in Oregon, 150 in Idaho, and 60 in Montana..
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Test the indicated claim about the means of two populations. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Use the traditional method or P-value method as indicated. 7) A researcher wishes to determine whether.
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Use the traditional method of hypothesis testing to test the given claim about the means of two populations. Assume that two dependent samples have been randomly selected from normally distributed populations. 15) A coach uses a new technique to train gymnasts. 7 gymnasts were randomly selected and their competition scores were.
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Perform the indicated goodness-of-fit test. 5) You roll a die 48 times with the following results. Use a significance level of 0.05 to test the claim that the die is fair. 6) In studying the responses to a multiple-choice test question, the following sample data were obtained. At the 0.05 significance level,.
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Provide an appropriate response. 7) Why do researchers concentrate on explaining an interaction in a two-way ANOVA rather then the effects of each factor separately? 8) The following data contains task completion times, in minutes, categorized according to 8) the gender of the machine operator and the machine used. The ANOVA results lead us.
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Use the rank correlation coefficient to test for a correlation between the two variables. 12) A placement test is required for students desiring to take a finite mathematics course at a university. The instructor of the course studies the relationship between students' placement test score and final course score. A random.
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Express the null hypothesis and the alternative hypothesis in symbolic form. Use the correct symbol (μ, p, σ) for the indicated parameter. 7) The manufacturer of a refrigerator system for beer kegs produces refrigerators that are supposed to maintain a true mean temperature, μ, of 48°F, ideal for a certain type.
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    Use the given degree of confidence and sample data to construct a confidence interval for the population mean μ. Assume that the population has a normal distribution. 1) A laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 185              1) milligrams with s = 17.6 milligrams. Construct.
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Provide an appropriate response. 10) Applicants for a particular job, which involves extensive travel in Spanish speaking 10) countries, must take a proficiency test in Spanish. The sample data below were obtained in a study of the relationship between the numbers of years applicants have studied Spanish (x) and their score.
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Express the null hypothesis and the alternative hypothesis in symbolic form. Use the correct symbol (μ, p, σ) for the indicated parameter. 20) An entomologist writes an article in a scientific journal which claims that fewer than 16 in ten thousand male fireflies are unable to produce light due to a.
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17) The following data contains task completion times, in minutes, categorized according to the gender of the machine operator and the machine used. Assume that two-way ANOVA is used to analyze the data. How are the ANOVA results affected if the times are converted to hours? 18) At the same time each.
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Provide an appropriate response. 7) The following data shows annual income, in thousands of dollars, categorized according to the two factors of gender and level of education. Assume that incomes are not affected by an interaction between gender and level of education, and test the null hypothesis that level of education.
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Perform the indicated goodness-of-fit test. 12) Among the four northwestern states, Washington has 51% of the total population, Oregon has 30%, Idaho has 11%, and Montana has 8%. A market researcher selects a sample of 1000 subjects, with 450 in Washington, 340 in Oregon, 150 in Idaho, and 60 in Montana..
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Provide an appropriate response. 1) List the advantages and disadvantages of nonparametric tests. Use the Wilcoxon signed-ranks test to test the claim that the matched pairs have differences that come from a population with a median equal to zero. 2) 11 runners are timed at the 100-meter dash and are timed again one.
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Provide an appropriate response. 9) Brian wants to obtain a confidence interval estimate of p1- p2 where p1 represents the proportion of American women who smoke and p2 represents the proportion of American men who smoke. He randomly selects 100 married couples. Among the 100 women in the sample are 21.
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Provide an appropriate response. 10) Describe what scatterplots are and discuss the importance of creating scatterplots. Use computer software to find the best multiple regression equation to explain the variation in the dependent variable, Y, in terms of the independent variables, X1, X2, X3. 11)   Suppose you will perform a test to determine whether.
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Provide an appropriate response. 10) A survey conducted in a small business yielded the results shown in the table. i) Test the claim that health care coverage is independent of gender. Use a 0.05 significance level. ii) Using Yates' correction, replace with and repeat the test. What effect does Yates' correction have on.
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Use the traditional method to test the given hypothesis. Assume that the population is normally distributed and that the sample has been randomly selected. 1) A manufacturer uses a new production method to produce steel rods. A random sample of 17 steel rods resulted in lengths with a standard deviation of.
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Use the traditional method to test the given hypothesis. Assume that the samples are independent and that they have been randomly selected 14) A marketing survey involves product recognition in New York and California. Of 558 New Yorkers surveyed, 193 knew the product while 196 out of 614 Californians knew the.
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Provide an appropriate response. 21) The following data shows the yield, in bushels per acre, categorized according to three varieties of corn and three different soil conditions. Assume that yields are not affected by an interaction between variety and soil conditions, and test the null hypothesis that variety has no effect.
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Provide an appropriate response. 18) When testing to determine if correlation is significant, we use the hypotheses H0: ρ = 0, H1: ρ ≠ 0. What does the the symbol ρ represent? Explain the meaning of the null and alternative hypotheses. Solve the problem. 19) A quadratic regression model is fit to a.
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According to Benford's Law, a variety of different data sets include numbers with leading (first) digits that follow the distribution shown in the table below. Test for goodness-of-fit with Benford's Law. 20) When working for the Brooklyn District Attorney, investigator Robert Burton analyzed the leading digits of the amounts from 784.
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Provide an appropriate response. 9) Explain the computation of expected values for contingency tables in terms of probabilities. Refer to the assumptions of the null hypothesis as part of your explanation. You might give a brief example to illustrate. 10) Discuss the three characteristics of a chi-square distribution. Perform the indicated goodness-of-fit test. 11).
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    Provide an appropriate response. 11)Describe the process for finding the confidence interval for a population proportion.              11)   Solve the problem. 12)A 99% confidence interval (in inches) for the mean height of a population is 65.7 < μ < 67.3. This              12) result is based on a sample of size 144. Construct the 95%.
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Test the claim that the samples come from populations with the same mean. Assume that the populations are normally distributed with the same variance. 12) The data below represent the weight losses for people on three different exercise programs. At the 1% significance level, does it appear that a difference exists in.
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