1. An experiment compared the ability of a group of chefs versus amateur cooks to taste...

1. An experiment compared the ability of a group of chefs versus amateur cooks to taste spices in a dish. The researchers recorded the total number of spices each person identified and calculated the statistics below. Group n Mean Variance Chefs 10 8.3 1.3 Amateurs 10 5.5 3.1 (a) Calculate the 99% confidence interval for the difference between the means of the two groups. (b) Do you think the mean difference between the groups in the population could be 0.5? Why or why not? z-scores Confidence z Interval 80% 1.282 85% 1.440 90% 1.645 95% 1.960 99% 2.576 99.5% 2.807 99.9% 3.291 t-scores df 0.95 0.99 2 4.303 9.925 5 2.571 4.032 6 2.447 3.707 7 2.365 3.499 8 2.306 3.355 9 2.262 3.25 10 2.228 3.169 18 2.101 2.878 19 2.093 2.861 20 2.086 2.845 21 2.080 2.831

Expert Solution

orchestra answered 1 year ago

Some lizards have the innate ability to change color, how would this affect the experiment? Group...

Some lizards have the innate ability to change color, how would this affect the experiment? Group of answer choices It would invalidate the entire experiment. No effect, if measured in their native habitat. The ability to change color or not change color would constitute excellent groups, but color changing by itself and without other data would not allow one to conclude anything. No effect, if measured on a standard background.

1. A taste-testing experiment has been designed so that four brands of Colombian coffee are to...

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1) What is the measure of the ability to generate sales from fixed assets? Group of...

1) What is the measure of the ability to generate sales from fixed assets? Group of answer choices Fixed assets turnover ratio Total assets turnover ratio Return on total assets Debt ratio 2)Do you want this measure higher or lower? Group of answer choices Higher Lower 3)What if we changed it to measure the ability to generate sales from total assets? Return on total assets Fixed assets turnover ratio Total asset turnover ratio Debt ratio 4)Do you want this measure...

Three groups are tested in an experiment and the results for the measurements are: Group 1:...

Three groups are tested in an experiment and the results for the measurements are: Group 1: 5, 7, 5, 3, 5, 3, 3, 9 Group 2: 8, 1, 4, 6, 6, 4, 1, 2 Group 3: 7, 3, 4, 5, 2, 2, 3, 3 Test for the equality of the means at 5% significance.

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1. Randomly selected statistics students participated in an experiment to test their ability to determine when 1 min has passed. Forty students yielded a sample mean of 58.3 sec. Assuming that s = 9.5 sec, use a 0.05 level of significance to test the claim that the population mean is equal to 60 sec. Be sure and include the appropriate interval (for alpha = .05, it is a 95% confidence level) in your conclusion. Conduct a hypothesis test. 3. Assume we want to...

ANOVA Part 1—A study compared five groups with six observations per group. An F statistic of...

ANOVA Part 1—A study compared five groups with six observations per group. An F statistic of 5.13 was reported. A.) Give the degrees of freedom for this statistic and be specific about which part you are referencing, numerator or denominator. B.) Find the P-value associated with this F-statistic. Show your calculator command in the space provided. Part 2—A study to compare four groups took random samples from each population of interest of sizes 38, 42, 21, and 45. The corresponding...

Pendulum experiment: 1) create a plot of length (x axis) versus average period (y axis). Make...

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1. A researcher is studying the effect of two different instructional programs (cooperative learning versus large-group...

1. A researcher is studying the effect of two different instructional programs (cooperative learning versus large-group lecture) on male and female students relative to attitudes toward mathematics. He is using a 2 by 2 factorial design. Write the three statistical hypotheses in words and in the context of the given research setting. 2. Let’s assume that in problem 1 above it was reported that FA (2, 55) = 1.03, p > .05, FB (2, 55) = 3.05, p > .05,...

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