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I need help on Business Stats Homework? Please anything will help:(?

I need help on Business Stats Homework? Please anything will help:(? Topic: University of texas homework
June 17, 2019 / By Brigham
Question: So let me phrase the question: A normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. a) The sample mean is less than 74. I do (74-75) / (5/ the square root of 40) = -1.264 Okay now here is where I get stuck. The answer is .1038 but I have NOOO idea how to get to that answer. Can someone please explain STEP by STEP how it is you get to that answer?? Thanks!!! :) b) Then I also have the sample mean is greater than 77 and the answer is .0057. How do I get to that answer??
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Best Answers: I need help on Business Stats Homework? Please anything will help:(?

Ahiram Ahiram | 3 days ago
Look up the value using a Z table. If you have trouble reading Z tables, update your question and I can use arrows to show how in a picture. I used the table below from Texas A and M University https://www.stat.tamu.edu/~lzhou/stat302... z(-1.26) = .10383 z(-1.27) = .10204 Now interpolate to find -1.2649 (I get closer to -1.2649 than -1.264 ) difference between -1.26 and -1.27 value is 0.10204 - 0.10383 = - 0.00180 If you teacher does not ask you to interpolate, take the closest value from table. Also, the table in text book may only have four digits accuracy, so z (-1.26) in your textbook may be 0.1038 and the value is closer to -1.2649 is close to -1.26 then -1.27 . Most table only allow have Z values to the nearest hundredth. (-1.26, -1.27) If you want to interpolate.: do the following: so (-1.26 - -1.27) = -0.01 (-1.264 - 1.26) = 0.0049 z(-1.2649) = 0.10383 - ( 0.00180)* (-0.0049/-0.01) ) = z(-1.264 = 0.10383 - (0.49)* (0.00180) = 0.10383 - 0.00088 = 0.10295 which if you round to four digit = 0.1030 Alternate use a calculator or spreadsheet which does the formula. norm.dist(-1.2649,0,1, TRUE) in Excel returns : 0.102954 Question 2. Z table return P(Xx) = 1 - P(X 77) = 1 - P(X<77) = 1 - 0.99430 = 0.0057 Get the ground rules from your teacher. Some never want you to interpolate. Also, if you will have to use a z-table in your test, find out what table you will need to use from your textbook. Otherwise, if they let use a calculator to find the values during a test, find out how to use the correct function on the calculator. Most TI graphing calculator has a function which return these values.
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Ahiram Originally Answered: Can someone help me with stats?
Hi, 1 The mean temperature in three rooms is 69.3 degreesFarenheit. If a fourth room is found to have a temperature of 71 degrees, what is the mean temperature of the four rooms? (3*69.3 + 71)/4 = 69.725 a. 69.3 b. 70.15 c. 70.325 d. 69.725 <==ANSWER e. none of the above #2 A market research company has collected data on the price of a particular brand of soap in several different locations. The prices are as follows: $0.89, 0.95, 1.25, 1.36, 1.49, 1.65, 1.79, 1.89, 1.99. What are the upper and lower quartiles of soap prices for this brand? minx = .89 Q1 = 1.1 Med = 1.84 Q3 = 1.84 maxx = 1.99 a. 1.79, 0.95 b. 1.99, 0.89 c. 1.79, 1.25 d. 1.84, 1.10 <==ANSWER e. 1.84, 1.17 I hope that helps!! :-)
Ahiram Originally Answered: Can someone help me with stats?
1-(69.3 +71)/4 = 69.725 2-there are too few values..but upper = 9/4 =2.25 of the values from the highest (1.99 1.89). lower = 2.25 of the values from the smallest (0.89, 0.95)

Ahiram Originally Answered: Stats hw help?
Remember you are testing the null hypothesis. Therefore the probability of the null hypothesis can not equal 0.62. because we know that the probability of the hypothesis equals 0.62. However you have not defined your hypothesis.
Ahiram Originally Answered: Stats hw help?
I have noooooooooooo idea but I don't think I have 2 cos I'm thriteen and suck at grade 8 maths anyway!!! :)

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