X has a normal distribution‚ and find the indicated probability. The mean is μ = 60.0 and the standard deviation is σ = 4.0. Find the probability that X is less than 53.0. Choose one answer. a. 0.5589 b. 0.0401 c. 0.9599 d. 0.0802 Question2 Marks: 1 Use the given degree of confidence and sample data to find a confidence interval for the population standard deviation. Assume that the population has a normal distribution. Weights of eggs: 95% confidence; n = 22‚ x = 1
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the center of a distribution of values. The three types of the central tendency are the mean‚ the median and the mode. Secondly‚ we will look at the dispersion which is the spread of values around the central tendency (Dodge 2003). The standard deviation is a more accurate way of measuring the dispersion. Thirdly‚ the use of graphics and tables to illustrate the data collected in a visual background. Fourthly there is the frequency distribution. In the frequency distribution is a summary of the
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Threesamma Joseph HLT-362V 9/7/2012 1. The answer is C‚ interval/ratio. The researchers analyzed the data as though it were interval/ratio level. They calculated the mean and standard deviation which is only appropriate for interval/ratio level data. 2. The mean post-test empowerment score for the control group is 97.12. This data is found explicitly in the chart of data given. 3. The baseline score mean is 14 and the post-test depression score mean is 13.36‚ meaning they were less depressed
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Value Range = 67 – 23 Range = 44 To find the standard deviation: σ = √∑ (X - µ)2 N σ = √∑(X – 40.84) 2 = √5291.36 = √211.65 = 14.55 25 25 Exercise 82* a. To find the mean cost: X = ∑fM = 7‚060 = $141.20 N 50 b. To find the standard deviation: s = √∑f (M - X)2 = √33‚728 = √688.33 = 26.24 n – 1 50 - 1 c. To find the proportion of costs within two standard deviations of the mean: X ± 2s 141.2 + 2(26.24) = 193.68 141.2 -
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mean to be 26.8 miles per gallon. From previous studies‚ the population standard deviation is known to be 5 miles per gallon. Could we reasonably expect that we could select such a sample if indeed the population mean is actually 28 miles per gallon? 2. Computing World has asserted that the amount of time owners of personal computers spend on their machines averages 23.9 hours per week and has a standard deviation of 12.6 hours per week. A random sampling of 81 of its subscribers revealed a sample
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AP/IB Biology Lab Assessment The effect of various fruit and vegetable cell membranes on their water potential Independent variable: Type of fruit or vegetable. (Produce used: Russet potatoes‚ Pascal celery‚ Gala apple‚ Navel orange‚ and Imperator carrot). The fruit or vegetable will be placed in six 56.7 gram cups‚ ranging with sucrose molarities of 0 (distilled water)‚ 0.2‚ 0.4‚ 0.6‚ 0.8‚ 1.0‚ with 5 trials‚ leading to 30 cups for each produce variable. Dependent variable: The water potential
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SPSS ASSIGNMENT #1 Read chapters 1‚ 2‚ and be sure to go through the SPSS tutorial (or “run the tutorial”). Then‚ follow these guidelines.S3 To Enter Data: 1. Click on the Variable View tab in the lower left corner of the screen. In the first box under the column Name‚ type the name you want to give the first variable (i.e.‚ “SCORE1” – NOTE: there are no spaces allowed in the variable name). The name of your variable can be up to eight characters (no spaces a permitted by SPSS in the variable
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an annual average tuition of $3800 and the population standard deviation of $620. Find the 95% confidence interval of the true mean. 3‚800+1.960 (620/√36) =4‚002.5 3‚800- 1.960 (620/√36)=3‚597.5 I am 95% confident the # is between 4‚002.5 and 3‚597.5 _ formula CI= X + Z(s/√n #3 A sample of 25 bank loan customers showed initial application times to have a mean of 22.55 minutes and a standard deviation of 3.8minutes. A) Find a 99 percent confidence interval for μ‚
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LEAD 6341 Research Methods and Statistics Midterm Exam Part II: Conceptual Problems (Open Book) Spring‚ 2013 1) Very briefly discuss the history of ethical problems in research in the US. Describe how current research policies and practices reduce the likelihood of ethical problems arising from research today. The Tuskegee study is an example of ethical problem in research in the US. The black subjects were promised medical care‚ meals‚ and burial insurance for their participation in
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1 3 6 4 7 5 4 6 4 7 1 8 1 More 0 Q1 Descriptive Statistics Excel Worksheet b Q2 d Q3 e Q4 b 5. For the following sample of scores: 2‚ 6‚ 1‚ 4‚ 2‚ 2‚ 4‚ 3‚ 2 Mean variance standard deviation 2.889 2.099 1.537 Find the mean‚ variance and standard deviation 6. A sample of size 7 (n = 7) has a mean of M = 9. One of the sample scores is changed from x = 19 to x = 5. What is the value for the new sample mean? New Sample Mean 7 7. Using Excel create a histogram
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