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statistics

1) a statistian claims that the average score on a test of students for students who major in psychology is greater than that of students who major in math results given to 50 students in each group are shown here Is there enough evidence to support the statisticians claim at @=0.01 Show work. Physc Math X1=118 X2=115 @1=15 @2=15 n1=50 n2=50 2) 2 brands of batteries are tested and their voltage compared The data follow Find the 95% confidence interval of the true difference of the mean Assume that both variables are normally distributed Show all the work Brand x Brand Y X1=9.2volts X2=88volts @1=0.3volts @2=01v... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

4270

OTA ID:

101733

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2 problems: 1) Two tailed difference between means 2) 90 % confidence interval

4) An office manager wishes to see whether the typing speed of 10 secretaries can be increased by changing over to computers. The number of words typed per minute is given here at @=0.10 is there enough evidence to conclude that by using computers the secretaries can type more words per minute. Show all the work Secretary Typewriter Computer 1 63 68 2 72 80 3 85 95 4 97 93 5 82 80 6 101 106 7 73 82 8 62 ... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

4271

OTA ID:

103060

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Testing a hypothesis.

The normal serum hemocrit level is 0.41 milligrams to 100 milligrams of blood. The level in elderly patients is significantly low at 0.31. 25 patients out of 100 are normal levels. The standard deviation is 0.6. A medication that is designed to increase the hemocrit is taken in 100 patients for one month. A testing is found that 45 patients have a mean average of 0.38 milligrams. As 0.1% does the medication increase the hemocrit levels? A. States the null and alternative hypothesis B. Define the statistic test C. Develop the decision rul. D. Compute the test statistic. E. State the conclusion.

Subject:

Statistics

Topic:

All Topics

Posting ID:

4299

OTA ID:

101733

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Probability

An urn contains 8 red chips, 10 green chips and 2 white chips. A chip is drawn and replaced and then a second chip is drawn. What is the probability of: A). a white chip on the first draw B). a white chip on the first draw and a red on the second C). two green chips being drawn D). a red chip on the second draw given a white chip was drawn on the first.

Subject:

Statistics

Topic:

All Topics

Posting ID:

4331

OTA ID:

101733

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Standard Deviation

Calculate the mean, median mode and standard deviation for each variable in the following data set. Note that the variables are the columns.

Subject:

Statistics

Topic:

All Topics

Posting ID:

4332

OTA ID:

103139

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