What Was The Standard Deviation Of The Sample?

From Mathematics Forum:

What was the standard deviation of the sample? To get an idea of ​​the average IQ level in the larger population, a sample is taken, and out of the result, we are going to construct a confidence interval. A random sample of 20 observations gave a mean IQ of 102.8, which resulted in a 95% confidence interval with the appearance (98.96, 106.64). What was the standard deviation of the sample? We assume that IQ is normally distributed in the population. 8.76 is wrong. The alternatives are: 7.8 8.0 8.1 7.9 8.2

Answer: use t s/sqrt(n)=ME (where ME is the margin of error, n=20, and t=2.093 (t-dist critical value for 2-sided Cong interval with 20-1=19 df). The ME is (106.64-98.96/2)=3.84. 2.093 s/sqrt(20) = 3.84. Solve for s to get s=8.2.

What Was The Standard Deviation Of The Sample?

From Mathematics Forum:

What was the standard deviation of the sample? To get an idea of ​​the average IQ level in the larger population, a sample is taken, and out of the result, we are going to construct a confidence interval. A random sample of 20 observations gave a mean IQ of 102.8, which resulted in a 95% confidence interval with the appearance (98.96, 106.64). What was the standard deviation of the sample? We assume that IQ is normally distributed in the population.

Answer: Standard deviation of the sample is first of all arrange in ascending or descending order then apply formula of standard deviation. thank you.

Where Can I Buy Supreme Quality Stretch Denim Fabric?

From Fashion & Accessories Forum:

Where can I buy supreme quality stretch denim fabric? 98-96% cotton and 2-4%lycra. I am willing to buy thousands of meters/yards.

Answer: Sounds like you need to go to a trade show if you're really willing to buy thousands of yards. e.g.: http://www.californiamarketcenter.com/markets/latextile_main.php

How Do You Find The Nth Term?

From Mathematics Forum:

How do you find the nth term? I need to work out the nth term of 98, 96, 94, 93 I would also like the formula to work this out.

Answer: X = 98 - (n x 2) Oh, I thought the 93 was a 92. Well I'll leave this up just in case it was a typo.

Can Anyone Help Me Calculate The Mean Percentage, Sums Of Squares, And Standard Deviation With This Problem?

From Mathematics Forum:

Can anyone help me calculate the Mean Percentage, Sums of Squares, and Standard deviation with this problem? In this experiment researchers used genetic engineering to modify the number of Suppressing receptors in the brains of voles. They were wondering if this would result in a change in their social behavior (time male and female spent huddling together). These next three questions ask you to calculate descriptive statistics for the two groups. All the data are given below under i. i) What is the mean percentage of huddling time for control and V1a-enhanced males? times for control males: 98, 96, 94, 88 , 86, 82, 77, 74, 70, 60, 59, 52, 50, 47, 40, 35 29, 13, 6, 5 times for V1a-enhanced males: 100, 97, 96 97, 93, 89, 88, 84, 77, 67, 61 a) 86% for control, 56% for enhanced b) 85% for control, 68% for enhanced c) 58% for control, 86% for enhanced d) 61% for control, 95% for enhanced ii) What is the Sums of Squares of huddling time for control and V1a-enhanced males? a) 16,819 for control; 1670 for enhanced b) 1670 for control; 16,819 for enhanced c) -63185 for control; -152 for enhanced d) - 152 for control; -63185 for enhanced iii. What is the Standard Deviation of huddling time for control and V1a-enhanced males? a) 58% for control, 3% for enhanced b) 12.9 % for control, 29.8% for enhanced c) 29.8 % for control, 12.9% for enhanced d) 3% for control, 58% for enhanced

Answer: I have done them for the controls; you may do it the same way for the v1-enhanced. Number of cases 20 To find the mean, add all of the observations and divide by 20 Mean 58.05 -------------------------------- Squared deviations (98-(58.05))^2 = (39.95)^2 = 1596.0025 (96-(58.05))^2 = (37.95)^2 = 1440.2025 (94-(58.05))^2 = (35.95)^2 = 1292.4025 (88-(58.05))^2 = (29.95)^2 = 897.0025 (86-(58.05))^2 = (27.95)^2 = 781.2025 (82-(58.05))^2 = (23.95)^2 = 573.6025 (77-(58.05))^2 = (18.95)^2 = 359.1025 (74-(58.05))^2 = (15.95)^2 = 254.4025 (70-(58.05))^2 = (11.95)^2 = 142.8025 (60-(58.05))^2 = (1.95)^2 = 3.8025 (59-(58.05))^2 = (0.95)^2 = 0.9025 (52-(58.05))^2 = (-6.05)^2 = 36.6025 (50-(58.05))^2 = (-8.05)^2 = 64.8025 (47-(58.05))^2 = (-11.05)^2 = 122.1025 (40-(58.05))^2 = (-18.05)^2 = 325.8025 (35-(58.05))^2 = (-23.05)^2 = 531.3025 (29-(58.05))^2 = (-29.05)^2 = 843.9025 (13-(58.05))^2 = (-45.05)^2 = 2029.5025 (6-(58.05))^2 = (-52.05)^2 = 2709.2025 (5-(58.05))^2 = (-53.05)^2 = 2814.3025 sum of squared deviations = 16818.95 ----------------------------------------------------- Add the squared deviations and divide by 19 variance = 16818.95/19 Variance 885.207895 Standard deviation = sqrt(variance) = 29.752444

Why Do Some Channels Not Have Signal On My Directv?

From Tito & DVDs Forum:

Why do some channels not have signal on my DirecTV? Some channels have a "Searching for Satellite Signal in 2...(771), We have had this problem for quite a while. Here's the signal strengths for each transponder: 96 98 96 82 96 99 96 100 96 99 96 72 96 100 96 99 96 87 96 82 97 100 97 100 96 95 96 0 97 100 95 100 Both Tuner 1 and Tuner 2 come in at 96% strength. (This is a HUD DVR) Our other TV (a standard DVR) has no problems. What could possibly be wrong?

Answer: Call Directive and ask them. It could be a DR problem, or it could be an issue with your dish.

How Do I Find The Standard Deviation In The Following Situation?

From Mathematics Forum:

how do I find the standard deviation in the following situation? with a mean of 105.83 ? the Numbers given are 114 100 104 89 102 91 114 114 103 105 108 130 120 132 111 128 118 119 86 72 111 103 74 112 107 103 98 96 112 112 93 (31 numbers all together) standard deviation?

Answer: I hope you don't have to do it by hand. if you use a calculator or computer you will get: Data: 72, 74, 86, 89, 91, 93, 96, 98, 100, 102, 103{3}, 104, 105, 107, 108, 111{2}, 112{3}, 114{3}, 118, 119, 120, 128, 130, 132 n= 31; Σx= 3281; Σx²= 353367; Σx³= 0; Σx^4= 0 σ= 14.0393; σn-1= 14.2714; Variance=σ²= 197.103; (σn-1)²= 203.6731 Mean(μ)= 105.8387; range= 60; mid-range= 102; median= 107; No Mode Five number summary: Q0= 72, Q1= 98, Q2= 107, Q3= 114, Q4= 132, IQR= 113

Are These Grades Good Enough To Get Into Cu Berkeley?

From Higher Education (University +) Forum:

Are these grades good enough to get into CU berkeley? these are my junior year grades as of first semester; my freshman and sophomore grades were a little lower. (First number is quarter 1, second number is quarter 2) Latin III - 99, 99 AP Bio - 99, 95 AP stats - 97, 99 AP English - 98, 96 AP History - 92, 97 HChem - 99, 94 HPrecalc - 99, 98 Thank you so much. i DO NT live in cal!

Answer: Berkeley gives priority consideration to in-state applicants. Out-of-state applicants are held to a higher standard for application evaluation. To be competitive, you should have excellent grades, good test scores, and fantastic extracurricular activities (leadership roles are essential).

Are These Grades Good Enough To Get Into Cu Berkeley?

From Other - Education Forum:

Are these grades good enough to get into CU berkeley? these are my junior year grades as of first semester; my freshman and sophomore grades were a little lower. (First number is quarter 1, second number is quarter 2) Latin III - 99, 99 AP Bio - 99, 95 AP stats - 97, 99 AP English - 98, 96 AP History - 92, 97 HChem - 99, 94 HPrecalc - 99, 98 Thank you so much. i DO NT live in cal!

Answer: You marks are fantastic. You will need a SAT score above 2000 or an ACT score above 29 to match. The difficulty is that you are out of state. CU Berkeley gives priority to California residents. What extracurricular activities do you have to offer? Do you play any sports? Any arts or music? What leadership activities and community service have you done? You need a lot of good extracurriculars and leadership accomplishments to make yourself look good to the admissions committee.

What Are My Chances Of Getting Into Townsend Harris?

From Genealogy Forum:

What are my chances of getting into Townsend Harris? I just completed Th grade and here are my grades. 1st quarter ND quarter RD Th Final Eng- 93 95 100 100 99 Math-98 96 95 94 96 Science-89 85 94 99 93 Band-97 97 97 100 99 Gym-99 99 99 100 99 Social Studies-99 99 98 99 99 spanish-95 95 96 97 96 average- 95.29 94.65 96.74 98.46 97.06 I have 2 absents and 23 lat es. How much will it affect my chances of getting in townsend? Thanks for answering :D

Answer: The grades are totally excellent. They will however bring up all of your lat es. Being on time for school is very important. It is just like being on time for your good job that you will get later in life as a result of your good grades. Keep up the excellent work!!!

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