Another statistics question? Is my answer correct again?
Yes, your answer is correct.
What are the correct answers to the following statistics questions?
It seems like all of your answers are correct except for the last one. This is not a probabilistically sound sampling since it entirely relies on the willingness of the volunteers to phone in.Take a look at the poll conducted by the Literary Digest in 1936 in an attempt to predict who is going to be the next president of the United States, Landon or Roosevelt. The Literary Digest polled approximately 2 million people yet got it wrong because they used the telephone. At the time, people who owned telephones were those who were rich. So the sample weren't representative of the whole voters.In this case, it could be different since telephones are now so popularized that almost everyone owns at least one. But phoning IN could indicate that the sample might consist only of those who feel strongly about either raising the tax or preventing the raise. So the sample is probably biased.
Is my answer correct for this Statistics question?
Let A = {2, 9}, B = {9, 17, 23}, D = {33} and S = sample space = A ∪ B ∪ D. Identify (Ac ∩ Bc)c. a) {2, 9} b) {2, 9, 17, 23} c) {2} d) {17} e) {9} f) None of the above. I think it should {33} because that is the only member that is not both in A and B. so the last option f) None of the above is correct. Am I right? If not could you please solve it using proper formulas? Thanks.
Statistics question 10 points for first correct answer?
EDITED. SORRY FOR I HAVE MADE A LITTLE MISTAKE IN THE PERVIOUS VERSIONS OF MY ANSWER SINCE I AM NOT THAT GOOD IN DESCRIBING THINGS IN WORDS. (a). Yes, we do have a valid probability distribution which is a discrete probability distribution because the sum of all probabilities for each value of x is sum to 1 and the probability for each value of x in the distribution is greater than zero. (b). SORRY, it is impossible to draw a graph on yahoo answer. But I can give you an idea on how to draw the graph. YOU NEED TO DRAW EACH FREQUENCY AS THE HEIGHT OF A RECTANGLE POSITIONED OVER EACH OF THE CORRESPONDING AGE RANGE OR AGE CLASS. (c). P(x≥60) = P(60
What would be the answer to "Is this a statistical question"?
One answer would be, ‘I have statistical data.’ Or ‘I am analyzing the data with statistical methods.’ Or, ‘My observations are qualitative, not statistical.’
Probability statistics questions, not sure if my answers are correct?
I'm not sure if I know what I'm doing and wanted to double check my answers on the stats practice quiz: Arsenic concentrations in the blood of healthy subjects is normally distributed with mean = 3.2 ug/dl and standard deviation = 1.5 ug/dl. a.) What is the probability a healthy subject has arsenic concentration greater than 6 ug/dl? My Answer: 0.0309 c.) What is the probability that a healthy subject has arsenic concentration between 2 and 4 ug/dl? My Answer: 0.4912 d.) What is the range of arsenic blood concentrations corresponding to the middle 90% of healthy subjects? My Answer: 0.733-5.66
Statistics expert.. correct my answers please..?
Laptop computers produced by a company have an average life of 38.36 months. Assume the life of a laptop computer is exponentially distributed. What is the probability that a laptop computer will fail within 12 months? a. 0.0007 b. 0.7314 c. 4.6714 d. 0.0261 e. 0.2686 I chose " e" A new medicine has an 85% success rate. Twenty patients are treated with it. What is the probability that exactly eighteen are cured with this new medicine? a. 0.2293 b. 0.0012 c. 0.8244 d. 0.7707 e. 0.0536 I chose " a " A new medicine has an 85% success rate. Five patients are treated with it. What is the probability that at least four are cured with this new medicine? a. 0.5563 b. 0.8352 c. 0.5220 d. 0.3915 e. 0.4437 again, I chose " a " are those answers right??
Statistics problems, are my answers correct?
I have 2 statistics problems that I've done and felt completely confident with them until I worked the problem a different way and got a different answer. I was wondering if you could tell me if I have the right answers or not. Thanks so much! A certain air plane has 2 independent alternators to provide electrical power. The probability that one will fail is .02, what is the probability that. (a) Probability both will fail = 0.0004 (b) Probability neither will fail (both will work fine) = 0.9604 (c) Probability one will fail = 0.0392 Problem 2: A random sample of 10 miniature tootsie rolls was taken from a bag, each piece weighed on a very accurate scale. The results in grams were: 3.087, 3.131, 3.241, 3.241, 3.27, 3.353, 3.4, 3.411, 3.437, 3.477 a)construct a 90% confidence interval for the true mean weight. b)what sample size would be necessary to estimate the true weight with an error of .03 grams with 90% confidence. c)discuss the factors which might cause variations in the weight of tootsie rolls during manufacturing. Answers to a, b, and c: A. Sample mean 3.3048 Sample SD (s) 0.1320 Sample size (n) 10 Since sample size is smaller than 30, we will use a t-distribution. Degree of freedom 9 Confidence level 90% Critical tc 1.833 Margin of error 0.0765 Lower limit 3.2283 Upper limit 3.3813 B. Margin of error 0.03 Confidence level 90% Critical tc 1.833 SD 0.1320 Required sample size 65.04451373 Rounded up 6o 66. C. Factors include:machines that divide the raw material cannot divide perfectly equally. Although each was weighed on a very accurate scale there is still error of measurement. The temperature utilized during candy manufacture, sharpness of cutting tools utilized to form pieces.
Is it true that frequentist statistics gives the right answer to the wrong question?
Is it true that frequentist statistics gives the right answer to the wrong question?Denis Lyndley thought so. However, he pointed out that, although he thought it is unsound, it usually gave reasonable answers. So wrong headed or not, it is useful. (Of course frequentists criticise Bayesian methods for treating fixed numbers (the parameters) as random.)