suewignall
05.10.2019 •
Mathematics
Can someone show me the steps to working this problem out because i got a test on this next week? for the in advance.
a light bulb producing company states that its lights will last an average of 1200 hours with a standard deviation of 200 hours. a sample of 100 light bulbs from the company were tested and the researcher found that the average life of each light bulb was 1050 hours. at a 95% confidence level, determine whether these light bulbs are in compliance with the company's claim.
Solved
Show answers
More tips
- H Health and Medicine How to Whiten Teeth and Get the Perfect Smile...
- F Food and Cooking How to Make Thin Pancakes: Recipe and Tips...
- S Style and Beauty Is Hot Scissor Haircutting Beneficial or Dangerous?...
- S Style and Beauty How to Get Rid of Under Eye Bruises?...
- F Food and Cooking Is Bacon Good for You?...
- S Style and Beauty Discover the Art of Nail Design: How Do You Paint Your Nails?...
- P Philosophy How to Develop Extrasensory Abilities?...
- O Other Everything You Need to Know About Kudyabliks...
- C Computers and Internet The Twitter Phenomenon: What it is and How to Use it...
- C Computers and Internet How to Choose a Laptop: Expert Guide and Tips...
Answers on questions: Mathematics
- M Mathematics What is the rate of change between the interval x=pi and x=3pi/2...
- M Mathematics 12 3 4 5 6 7 8 9 10 time remaining 59: 02 charlie is evaluating the product of 0.09 and 0.05. he multiplies, and before placing the decimal, arrives at an answer of 45. after considering...
- M Mathematics The following figure shows four lines intersecting at a point. in a complete sentence, describe the angle relationship in the diagram. write an equation for the relationship shown...
- M Mathematics Consider the function f left parenthesis x right parenthesis equals 4 x squared minus 3 x minus 1f(x)=4x2−3x−1 and complete parts (a) through (c). (a) find f left parenthesis a...
- M Mathematics To keep cylindrical tanks from tipping over, a designer is planning to enlarge the original area of the base by 50%. the new tank should have the same volume as the original. how...
- M Mathematics 9000 dollars is placed in an account with an annual interest rate of 8%. how much will be in the account after 17 years, to the nearest cent?...
- M Mathematics Point q is located at (−4,6). point r is located at (8, 6). what is the distance from point q to point r?...
- M Mathematics Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. monthly temperatures: 63 degrees upper f comma 67 degrees upper f comma...
- M Mathematics The daily production of a company is modeled by the function p = -w^2 + 75w - 1200. the daily production, p, is dependent on the number of workers (w) present. if the break-even...
- M Mathematics Select the correct number from each list to complete the equation....
Ответ:
First find the Confidence Interval (CI), then examine if 1050 falls within the range
CI = mean +/- (z*)(standard deviation)/sqrt n
where z* comes from the standard normal table with 5%/2 = 0.025 in each tail.
z* = 1.96
CI = mean +/- (z*)(standard deviation)/sqrt n
CI = 1200 +/- (1.96)(200)/sqrt 100
CI = 1160.8 to 1239.2
Since 1050 DOES NOT fall within the CI, you would REJECT the hypothesis that these bulbs are in compliance. I hope this helps.
Ответ:
First term = a = 125
Step-by-step explanation:
Question: find the number of shoppers on the first day
This is a geometric progression question
The sum of the terms = 671
Sum of a geometric sequence,Sn = (ar^n - 1) / (r - 1)
Where,
n = number of term in the sequence.
a = first term in the sequence.
r = common ratio
r = 1 + 20%
= 1 + 20/100
= 1 + 0.2
= 1.2
n = 4 (first 4 days)
Sn = (ar^n - 1) / (r - 1)
Sn = 671 where n = 4
671 = {a × 1.2^(4) - 1} / 1.2 - 1
671 = {a × 2.0736 - 1} / 0.2
671 = (2.0736a - a) / 0.2
671 = 1.0736a / 0.2
671 = 5.368a
Divide both sides by 5.368
a = 671 / 5.368
a = 125