Question

In: Statistics and Probability

Twelve batteries were tested to see how many hours they would last. The frequency is Hours...

Twelve batteries were tested to see how many hours they would last. The frequency is
Hours Frequency (f) Midpoint (Xm) f*Xm C f (X - X̅ )² f (X - X̅ )²
1-3 1 1+3/2 = 4/2 = 2 1x2 = 2 1 27.5625 27.5625
4-6 4 4+6/2= 10/2= 5 4x5 = 20 1+4 = 5 5.0625 20.25
7-9 5 7+9/2 = 16/2 = 8 5x8 = 40 1+4+5 = 10 0.5625 2.8125
10-12 1 10+12 = 22/2 = 11 1x11 = 11 (1+4+5+1) = 11 14.0625 14.0625
13-15 1 13+15 = 28/2 = 14 1x14 = 14 (1+4+5+1+1)= 12 45.5625 45.5625
Total 12 87 92.8125 110.25

Median

Range:

3rd Quartile:

45th Percentile:

Solutions

Expert Solution

MEdian:

Range:

Highest number = 15 in the hours: Lowest number - 1

Range = 15 - 1 = 14

3rd Quartile:

45th Percentile:

:

orchestra answered 1 year ago
Next > < Previous

Related Solutions

A company manufacturing batteries says that its batteries will last 1400 hours. Suppose that the life...
A company manufacturing batteries says that its batteries will last 1400 hours. Suppose that the life times of the batteries are approximately normally distributed, with a mean of 1450 hours and a standard deviation of 60 hours. a) What proportion of the batteries will last less than 1400 hours? b) What is the probability that a randomly selected batteries will last at least 1550 hours? c) How many hours would represent the cutoff for the top 10% of all batteries?...
A battery company claims that their batteries last on average 60 hours. The standard deviation of...
A battery company claims that their batteries last on average 60 hours. The standard deviation of the battery life is 4 hours. Assuming that their claim is true, what would be the lowest 5% of values we would get if we were to sample 100 batteries and find their mean life length? Please show me how to do it, thank you!
A battery company claims that their batteries last on average 60 hours. The standard deviation of...
A battery company claims that their batteries last on average 60 hours. The standard deviation of the battery life is 4 hours. Assuming that their claim is true, what would be the lowest 5% of values we would get if we were to sample 100 batteries and find their mean life length?
5. Eyeglassomatic manufactures eyeglasses for different retailers. In March 2010, they tested to see how many...
5. Eyeglassomatic manufactures eyeglasses for different retailers. In March 2010, they tested to see how many defective lenses they made, and there were 18.7% defective lenses due to scratches. Suppose Eyeglassomatic examined fifteen eyeglasses. For each part Round to 4 decimal places a) < 2 points > State: n = p = b) Find the prob the none are scratched. c) Find the exactly 6 are scratched. d) Find the probability that at least 4 are scratched. e) Find the...
A new vaccine was tested to see if it could prevent the ear infections that many...
A new vaccine was tested to see if it could prevent the ear infections that many infants suffer from. Babies about a year old are randomly divided into two groups. One group received vaccinations, and the their did not. The following year, only 337 of 2460 vaccinated children had ear infections, compared to 491 of 2446 unvaccinated children. A.) Let P1 be the sample proportion of success in the unvaccinated group and let P2 be the sample proportion of success...
A new vaccine was tested to see if it could prevent the ear infections that many...
A new vaccine was tested to see if it could prevent the ear infections that many infants suffer from. Babies about a year old were randomly divided into two groups. One group received​vaccinations, and the other did not. The following​ year, only 338 of 2453 vaccinated children had ear​ infections, compared to 504 of 2455 unvaccinated children. Complete parts​ b) through​ c) below. B.) Let P1 be the sample proportion of success in the unvaccinated group and let P2 be...
A new vaccine was tested to see if it could prevent the ear infections that many...
A new vaccine was tested to see if it could prevent the ear infections that many infants suffer from. Babies about a year old were randomly divided into two groups. One group received​ vaccinations, and the other did not. The following​ year, only 331 of 2454 vaccinated children had ear​ infections, compared to 507 of 2453 unvaccinated children. Complete parts​ a) through​ c) below. ​a) Are the conditions for inference​ satisfied? A. No. The groups were not independent. B. No....
The capacities (in ampere-hours) were measured for a sample of 120 batteries. The average was 178...
The capacities (in ampere-hours) were measured for a sample of 120 batteries. The average was 178 and the standard deviation was 12. a.) Find a 95% lower confidence bound for the mean capacity of this type of battery. Round the answer to two decimal places. b.) An engineer claims that the mean capacity is greater than 175 ampere-hours. With what level of confidence can this statement be made? Express the answer as a percent and round to two decimal places.
A battery company claims that its batteries last an average of 100 hours under normal use....
A battery company claims that its batteries last an average of 100 hours under normal use. After several complaints that the batteries do not last this long, an independent testing laboratory decided to test the company’s claim with a random sample of 42 batteries. The data from the 42 batteries appeared to be unimodal and symmetric with a mean 97 hours and a standard deviation of 12 hours. What sample size would allow us to increase our confidence level to...
Thirty graduate students were asked how many credit hours they were taking in the current quarter.
Student Number Credit Hours 1 4 2 11 3 3 4 5 5 7 6 11 7 10 8 8 9 12 10 12 11 6 12 6 13 12 14 7 15 8 16 5 17 6 18 7 19 10 20 11 21 12 22 8 23 6 24 10 25 11 26 3 27 5 28 12 29 8 30 11 Thirty graduate students were asked how many credit hours they were taking in the current quarter....
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT