![mydoggy152](/avatars/16625.jpg)
mydoggy152
20.04.2020 •
Mathematics
Anyone understand this
Solved
Show answers
More tips
- C Computers and Internet How to Delete a Page on VKontakte: The Ultimate Guide from Experts...
- S Style and Beauty 5 Tips for Choosing the Best Ugg Boots...
- H Health and Medicine How to Treat the Flu: A Comprehensive Guide...
- H Health and Medicine Effective Ways to Treat Colic in Infants...
- C Computers and Internet IMHO: What is it, why is it important, and how to use it?...
- F Food and Cooking How to Calculate the Gender of Your Child with Blood?...
- S Style and Beauty How to Get Rid of Under Eye Bruises?...
- C Cities and Countries What time does the Metro open in Moscow?...
- W Work and Career Where can you learn to be a flight attendant?...
- H Health and Medicine What are Electronic Cigarettes? The Ultimate Guide...
Answers on questions: Mathematics
- M Mathematics The variables y and x have a proportional relationship, and y = 25 when x = 60. What is the value of x when y = 30? A. x = 25 B. x = 36 C. x = 50 D. X= 72...
- P Physics At 18◦c, an aluminum ring has an inner diameter of 2 cm and a brass rod has a diameter of 2.07 cm. if the temperature coefficient of expansion for brass is 1.9 × 10−5 ( ◦c)−1 and...
- P Physics Austin performed an experiment. He put 100mL of vegetable oil (density 0.9 g/ml) in a graduated cylinder. He put a 100g mass of an unknown metal in to the oil and it sank while...
- S Social Studies When the Israelites returned to Canaan, they found other groups already living there. In the organizer below, identify three facts about two of these groups, the Phoenicians and...
Ответ:
Step-by-step explanation:
plz give brainliest
Ответ:
Problem 1
Choice C) sample is appropriately large; margin of error is plus/minus 0.187
Explanation:
At 90% confidence, the z critical value is roughly z = 1.645 (this is found using a table in the back of your textbook)
n = 250 is the sample size, which is appropriately large (it's over n = 30)
s = 1.8 is the standard deviation
The margin of error E is found by the formula below
E = z*s/sqrt(n)
E = 1.645*1.8/sqrt(250)
E = 0.18727008303518
E = 0.187
note: the sample mean is not used at all in the computation of the margin of error.
Problem 2
Choice D) both are effective; however, Intensity program is more effective compare to Q30X program
Explanation:
There's not much to say here other than your teacher really wrote a lot to set up this problem. There's a lot of extra filler that you need to toss out and ignore. Basically the short of it is that Brant wants to run faster so he tests two programs. He finds that both are effective (since they both yield roughly the same percent decrease in run times) but the Intensity program is better by two percentage points. It's not much, but it's something. So this is why the answer is choice D.
Problem 3
Choice A) appropriately large; margin of error is plus/minus 0.079
Explanation:
n = 150 is the sample size. It is appropriately large as it is over n = 30
At 95% confidence, using a stats table (in the back of your book) you should find the critical value is z = 1.960
p = 0.56 is the decimal version of 56%, this is the proportion of those who use public transportation
We'll use a slightly different margin of error formula. This time it's to measure the error for proportions (rather than means)
E = z*sqrt(p*(1-p)/n)
E = 1.960*sqrt(0.56*(1-0.56)/150)
E = 0.07943845584267
E = 0.079