Answered: What size samples do you need for a…

What size samples do you need for a 2-group design if you expect to have an effect size of .50 and you want your power to be .71?

College Algebra

10th Edition

ISBN:9781337282291

Author:Ron Larson

Publisher:Ron Larson

Chapter5: Exponential And Logarithmic Functions

Section5.5: Exponential And Logarithmic Models

Problem 6ECP: Find the intensities of earthquakes whose magnitudes are (a) R=6.0 and (b) R=7.9.

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Find the intensities of earthquakes whose magnitudes are (a) R=6.0 and (b) R=7.9.
You want to determine the effect of soap on bacterial colonies. In order to make sure that the environment does not affect your experiment, you divide 13 different petri dishes in half - one side is exposed to soap, the other is a control. You may use R but please show all the steps and codes involved. You measure the number of colonies that grow in each petri dish and come up with the following results: petri dish: 1 2 3 4 5 6 7 8 9 10 11 12 13soap: 10 5 7 10 19 11 13 17 19 8 11 10 16control: 20 17 11 17 26 18 21 25 24 17 17 17 21 Perform a complete hypothesis test to see if there is a difference in bacterial colonies between the soap and control dishes.
Does cell phone use while driving impair driver reaction times? At the Univ. of Utah the times (in milliseconds) of 32 drivers using cell phones to depress the brake pedal were compared to the reaction times of 32 drivers who were listening to the radio. For the cell phone users the results were = 585.2, s = 89.6; for the radio listeners the results were = 533.7, s = 65.3. Determine a 95% confidence interval for μ-μ where μ is the mean reaction for drivers using cell phones. Use df = 57.
You have noticed that UMD students seem to drink more coffee (on average) the longer they have been in school. To study this question, you survey 200 students and obtain their average weekly coffee intake. Data are collected using a between-subjects approach on 50 Freshmen, 50 Sophomores, 50 Juniors, and 50 Seniors. The data are presented in terms of how many cups of coffee, on average, each class drank per week. Here is what was found: Freshmen (M= 11.5, SD=3.1) Sophomore (M= 12.1, SD=2.2) Junior (M= 15.3, SD=2.5) Senior (M-19.8, SD=3.0) F(3,196)= 6.5, p = .004, n² = .32, Tukey's HSD = 2.4 Based on the nature of the independent variable and design of the study, what statistical test should have been used? OA. Dependent (paired samples) t-test OB. One-way ANOVA OC. Independent samples t-test Save Answer O D. Repeated Measures ANOVA
first part is the question, and the second part is the choices
Elena is interested in whether music affects plant growth. For a science fair project, she will grow one plant in a room that is normally kept quiet. She will grow another plant in another room that has classical piano music playing all the time. After 2 months, she compares the height of the plants to determine the effect of music on plant growth. What type of study is Elena designing? How could her design be improved to collect data that would be better for answering the question of interest?
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Paolo studies bees and honey production. He gathers data on the bee population of a honeycomb and theamount of honey produced for both wild bees and farm bees. Identify the type of study and what relationship is beingexamined.
can you please show the step by step solution. please do not skip steps. Explain how you got the answer you did
A survey looked at how long it takes a typical company to recoup an investment in research. The survey determined that 39% of the corporations took six months or less to recoup their investment. The data table below shows a sample of the time, in months, it might have taken 20 corporations to recoup their investment. Complete parts a and b. 9.0 8.0 4.0 4.0 7.0 8.0 7.0 7.0 9.5 5.5 7.5 12.0 8.5 5.5 10.5 10.0 7.5 4.5 7.0 7.5 a. Determine the number of corporations that recovered their investement in research in six months or less. There were 5 corporations that recovered their investment in research in six months or less. b. Calculate the probability of obtaining at most the number of corporations that you determined in part a if the percent of those recovering their investment is as indicated by the survey. The probability (Round to four decimal places as needed.)
Explain