3. A printer company claims that the mean warm-up time of a certain brand of printer...
3. A printer company claims that the mean warm-up time of a certain brand of printer is 15 seconds. An engineer of another company is conducting a statistical test to show this is an underestimate.
a) State the testing hypothesis.
b) The test yielded a p-value of 0.035. What would be the decision of the test if a= 0.05?
c) Suppose a further study establishes that the true mean warm-up time is 14 seconds. Did the engineer make the correct decision? If not, what type of error did he/she make?
Homework Answers
Add Answer to:
3. A printer company claims that the mean warm-up time of a
certain brand of printer...
A computer company claims that the batteries in its laptops last 4 hours on average. A...
A computer company claims that the batteries in its laptops last 4 hours on average. A consumer report firm gathered a sample of 16 batteries and conducted tests on this claim. The sample mean was 3 hours 50 minutes, and the sample standard deviation was 20 minutes. Assume that the battery time distribution as normal. Test if the average battery time is shorter than 4 hours at α = 0.05. Use the 5-step method. b) Construct a 95% confidence interval...
The manufacturer of a certain brand of auto batteries claims that the mean life of these...
The manufacturer of a certain brand of auto batteries claims that the mean life of these batteries is 45 months. A consumer protection agency that wants to check this claim took a random sample of 24 such batteries and found that the mean life for this sample is 43.35 months. The lives of all such batteries have a normal distribution with the population standard deviation of 4.5 months. Find the p-value for the test of hypothesis with the alternative hypothesis...
30-33) an educational testing company claims that taking their course will result in students with higher...
30-33) an educational testing company claims that taking their course will result in students with higher saverage test scores.. To test this claim a sample of 35 students who took the course and 48 students who did not take the course was taken and yielded the following results: Course 1028 No course Sample mean Sample standard deviation90 983 105 31. Formulate the hypothesis that can be used to test the educational testing company's claim 32. Find the value of the...
9.25 The manufacturer of a certain brand of auto batteries claims that the mean life of...
9.25 The manufacturer of a certain brand of auto batteries claims that the mean life of these batteries is 45 months. A consumer protec- tion agency that wants to check this claim took a random sample of 24 such batteries and found that the mean life for this sample is 43.05 months. The lives of all such batteries have a normal distribution with the population standard deviation of 4.5 months. a. Find the p-value for the test of hypothesis with...
The manufacturer of a certain brand of auto batteries claims that the mean life of these...
The manufacturer of a certain brand of auto batteries claims that the mean life of these batteries is 45 months. A consumer protection agency that wants to check this claim took a random sample of 24 such batteries and found that the mean life for this sample is 43.05 months. The lives of all such batteries have a population standard deviation of 4.5 months. Perform a hypothesis test at 10% significance level and state your decision using critical value approach....
3. The nicotine content in cigarettes of a certain brand is normally distributed with mean (in...
3. The nicotine content in cigarettes of a certain brand is normally distributed with mean (in milligrams) 4. The brand advertises that the mean nicotine content of their cigarettes is 1.5, but measurements on a random sample of 100 cigarettes of this brand gave a mean of r = 1.53 and standard deviation s=0.1. Is there sufficient evidence in the sample to suggest that the mean nicotine content is actually higher than advertised? Use a = 0.05. (Hint: follow the...
Suppose that the mean time for a certain car to go from 0 to 60 miles...
Suppose that the mean time for a certain car to go from 0 to 60 miles per hour was 7.6 seconds. Suppose that you want to set up a statistical test to challenge the claim of 7.6 seconds. What would you use for the null hypothesis? H0 : μ > 7.6 seconds H0 : μ = 7.6 seconds H0 : μ < 7.6 seconds H0 : μ ≠ 7.6 seconds H0 : μ ≤ 7.6 seconds
A local politician running for reelection claims the mean prison time for car thieves is less...
A local politician running for reelection claims the mean prison time for car thieves is less than the required 6 yrs. A sample of 80 convicted car thieves was randomly selected and the mean length of prison time was found to be 5.5 yrs. with a standard deviation of 1.25 yrs. alpha=0.05 State the claim mathematically. Is the claim the null or alternative hypothesis? State your hypotheses. Determine the test of significance (t-test or z-test) and justify your choice. State...
A consumer group claims that the mean minimum time it takes for a sedan to travel...
A consumer group claims that the mean minimum time it takes for a sedan to travel a quarter mile is greater than 14.6 seconds. A random sample of 23 sedans has a mean minimum time to travel a quarter mile of 15.4 seconds and a standard deviation of 2.12 seconds. At a = 0.05 is there enough evidence to support the consumer group's claim? Complete parts (a) through (d) below. Assume the population is normally distributed (Round to two decimal...
A cereal company claims that the mean weight of the cereal in its packets is more...
A cereal company claims that the mean weight of the cereal in its packets is more than 14 oz. The weights (in oz) of the cereal in a random sample of 8 cereal packets are listed below. You may assume the sample data comes from a population that follows a normal distribution. Using a 0.05 significance level, test the companies claim. State the null hypothesis H0. State the alternative hypothesis H1. What is the test statistic? State the alpha level....
30-33) an educational testing company claims that taking their course will result in students with higher saverage test scores.. To test this claim a sample of 35 students who took the course and 48 students who did not take the course was taken and yielded the following results: Course 1028 No course Sample mean Sample standard deviation90 983 105 31. Formulate the hypothesis that can be used to test the educational testing company's claim 32. Find the value of the...
9.25 The manufacturer of a certain brand of auto batteries claims that the mean life of these batteries is 45 months. A consumer protec- tion agency that wants to check this claim took a random sample of 24 such batteries and found that the mean life for this sample is 43.05 months. The lives of all such batteries have a normal distribution with the population standard deviation of 4.5 months. a. Find the p-value for the test of hypothesis with...
3. The nicotine content in cigarettes of a certain brand is normally distributed with mean (in milligrams) 4. The brand advertises that the mean nicotine content of their cigarettes is 1.5, but measurements on a random sample of 100 cigarettes of this brand gave a mean of r = 1.53 and standard deviation s=0.1. Is there sufficient evidence in the sample to suggest that the mean nicotine content is actually higher than advertised? Use a = 0.05. (Hint: follow the...
A consumer group claims that the mean minimum time it takes for a sedan to travel a quarter mile is greater than 14.6 seconds. A random sample of 23 sedans has a mean minimum time to travel a quarter mile of 15.4 seconds and a standard deviation of 2.12 seconds. At a = 0.05 is there enough evidence to support the consumer group's claim? Complete parts (a) through (d) below. Assume the population is normally distributed (Round to two decimal...
Most questions answered within 3 hours.
-
Based on how much or how little you have noticed in the media,
do you think...
asked 1 hour ago -
I calculate Rosetta Stone’s P/E ratio as 10x prior to a report
about future industry growth....
asked 2 hours ago -
What major physiological changes account for electrodermal
activity (as in during a lie-detector test)?
asked 3 hours ago -
You are going to sell fruits & vegetables at a local
roadside market. List separately and...
asked 4 hours ago -
Hows does water affect the digestion of fats ?
asked 6 hours ago -
A buffer that contains 0.41 M of a base, B and 0.21 M of its
conjugate...
asked 6 hours ago -
Pleaaaaaaaasssssse help me please please it's more important
:((((((((((((((((((((
CASE STUDY
Nissan Company
Nissan Motor Company,...
asked 6 hours ago -
Calculate the concentration of hydronium and hyroxide ions in 1)
2.0 mol/L HNO3 2) 0.5 mol/L...
asked 6 hours ago -
In a loop-the-loop ride a car goes around a vertical, circular
loop at a constant speed....
asked 6 hours ago -
50 grams each of water (18.015 g/mol) and ethylene glycol
(C2H6O2) (62.07 g/mol) are mixed. At...
asked 6 hours ago -
The life expectancy of sport utility vehicles follows a normal
distribution with a mean of 145.8...
asked 7 hours ago -
If an object with mass of 5 kg is pushed with a force of 552 N,...
asked 6 hours ago