Question

(a) A consumer organization is testing two different brands of battery. A sample of 15 of...

(a) A consumer organization is testing two different brands of battery. A sample of 15 of brand A shows an average useful life of 410 hours with a standard deviation of 20 hours. For brand B, a sample of 20 gave an average useful life of 391 hours with standard deviation 26 hours. Assuming equal variances, test whether there is any significant difference in battery life. Use p-value approach and assume 1% level of significance. (b) What assumptions are being made about the populations in carrying out this test?

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A consumer advocate researches the length of life between two brands of refrigerators, Brand A and...
A consumer advocate researches the length of life between two brands of refrigerators, Brand A and Brand B. He collects data (measured in years) on the longevity of 40 refrigerators for Brand A and repeats the sampling for Brand B. These data are measured in years. (You may find it useful to reference the appropriate table: z table or t table) Brand A Brand B Brand A Brand B 23 12 21 18 22 15 17 20 18 20 20...
the mean life of a name brand aa battery is 19 hours. a consumer group is...
the mean life of a name brand aa battery is 19 hours. a consumer group is interested in determining if generic aa batteries have a shorter mean life. this group tested a random sample of 9 generic AA batteries resulting in a mean life of 17.4 hours with a standard deviation of 1.5 hours. you may assume that battery lives follow a normal distribution. At 1% level of significance, do the generic AA batteries have a mean life shorter than...
A consumer advocate researches the length of life between two brands of refrigerators, Brand A and...
A consumer advocate researches the length of life between two brands of refrigerators, Brand A and Brand B. He collects data (measured in years) on the longevity of 40 refrigerators for Brand A and repeats the sampling for Brand B. These data are measured in years. (You may find it useful to reference the appropriate table: z table or t table) Brand A Brand B Brand A Brand B 25 21 18 19 15 15 24 19 24 15 17...
A consumer organization collected data on two types of batteries, A and B. The summary statistics...
A consumer organization collected data on two types of batteries, A and B. The summary statistics for 12 observations of each type are x(bar)A=365.1 minutes and sA=14.3, and x(bar)B=342.1 minutes and sB=9.3. a.) Is there evidence to support the claim that type A battery mean life exceeds that of type B? Assume that both populations are normally distributed but the variances are not equal. Assume α=0.1 b.] Test the hypothesis in part (a) using the corresponding confidence interval
A consumer magazine is testing the lives of two kinds of flashlight batteries. Britelite battery claims...
A consumer magazine is testing the lives of two kinds of flashlight batteries. Britelite battery claims to give more life in normal use but is more costly than ordinary batteries. The magazine randomly purchases 50 Britelite batteries and 50 ordinary batteries. The Britelite batteries are found to have a mean life of 17.5 months of normal use with a standard deviation of 1.1 months. The ordinary batteries have a mean life of 14.7 months of normal use with a standard...
A statistician employed by a consumer testing organization reported that at 95% confidence he has determined...
A statistician employed by a consumer testing organization reported that at 95% confidence he has determined that his estimate content of a particular soft drink is within 0.3 ounces of the true population average content. He forgot to report the size of the sample selected. Assuming the population standard deviation is 1.18, determine the size of the sample.
A battery pack used in a medical device needs to be recharged about every 5 hours....
A battery pack used in a medical device needs to be recharged about every 5 hours. A random sample of 60 battery packs is selected and subjected to a life test. The average life of these batteries is 5.05 hours. Assume that battery life is normally distributed with standard deviation ? = 0.3 hours. Is there evidence to support the claim that mean battery life is not 5 hours? Use ? = 0.01. a. Use P-value approach to test the...
Question 4 A statistician employed by a consumer testing organization reports that at 90% confidence he...
Question 4 A statistician employed by a consumer testing organization reports that at 90% confidence he has determined that the true average content of the Uncola soft drinks is between 11.8 to 12.2 ounces. He further reports that his sample revealed an average content of 12 ounces, but he forgot to report the size of the sample he had selected. Assuming the standard deviation of the population is 0.72, determine the size of the sample.
A battery pack used in a medical device needs to be recharged about every 5 hours....
A battery pack used in a medical device needs to be recharged about every 5 hours. A random sample of 60 battery packs is selected and subjected to a life test. The average life of these batteries is 5.05 hours. Assume that battery life is normally distributed with standard deviation ? = 0.3 hours. Is there evidence to support the claim that mean battery life is not 5 hours? Use ? = 0.01. a. Write the appropriate hypothesis. b. Use...
A statistician employed by a consumer testing organization reported that at 95% confidence he has determined...
A statistician employed by a consumer testing organization reported that at 95% confidence he has determined that his estimate content of a particular soft drink is within 0.3 ounces of the true population average content. He forgot to report the size of the sample selected. Assuming the population standard deviation is 1.18, determine the size of the sample. 12 28 59 60
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT