Question

Question 6: (1.5 marks) The true mean of the cost of a certain type of surgeries...

Question 6: (1.5 marks) The true mean of the cost of a certain type of surgeries is ? = 5000 riyals. Also, it is known that the population standard deviation of the costs is ? = 150. Find the probability that a sample of size ? = 60 surgeries yields a sample mean (?̅) more than 4950 Riyals.

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
The true mean of the cost of a certain type of surgeries is ? = 5000...
The true mean of the cost of a certain type of surgeries is ? = 5000 riyals. Also, it is known that the population standard deviation of the costs is ? = 150. Find the probability that a sample of size ? = 60 surgeries yields a sample mean (?̅) more than 4950 Riyals.
Suppose the average lifetime of a certain type of car battery is known to be 60...
Suppose the average lifetime of a certain type of car battery is known to be 60 months. Consider conducting a two-sided test on it based on a sample of size 25 from a normal distribution with a population standard deviation of 4 months. a) If the true average lifetime is 62 months and a =0.01, what is the probability of a type II error? b) What is the required sample size to satisfy and the type II error probability of...
An engineer wanted to estimate the true mean resistance of a certain electrical circuits (?) by...
An engineer wanted to estimate the true mean resistance of a certain electrical circuits (?) by a sample mean (?̅). It is known that the population is normal, and the population standard deviation is ?=0.25 ohms. Determine the required sample size (?) so that he will be 90% confident of being correct within ± 0.06.
Question 4: Confidence Intervals: Each question is worth 7.5 marks: Total (15 marks) A. Suppose we...
Question 4: Confidence Intervals: Each question is worth 7.5 marks: Total A. Suppose we know the population standard deviation is 0.03. We have a sample size of 121. We also have a sample proportion of 0.65 and a confidence interval of 90%. Find the interval for the population proportion with 90% confidence level? ________________________________ B. Suppose we know the population standard deviation is 4. We have a sample size of 144. We also have a sample mean of 55 and...
An article reports that in a sample of 123 hip surgeries of a certain type, the...
An article reports that in a sample of 123 hip surgeries of a certain type, the average surgery time was 136.9 minutes with a standard deviation of 22.9 minutes. (A) Find a 98% lower confidence bound for the mean time. Round the answer to two decimal places. The 98% lower confidence bound is: (B) Someone says that the mean time is greater than 134.26 minutes. With what level of confidence can this statement be made? Express the answer as a...
A certain type of stainless steel powder is supposed to have a mean particle diameter of...
A certain type of stainless steel powder is supposed to have a mean particle diameter of 15 microns. A random sample of 50 particles had a mean diameter of 15.2 microns. If the population standard deviation is 0.6 microns, is there any evidence to suggest that the population has a mean diameter of 15 microns? Assume ? = 0.05. a. Use P-value method to test the hypothesis. b. Clearly write your conclusion. c. If the true mean diameter is 15.2...
A supermarket wants to estimate the population mean weight of watermelons of a certain type. A...
A supermarket wants to estimate the population mean weight of watermelons of a certain type. A sample size n = 45 has sample mean = 20 pounds with sample standard deviation s = 2.2 pounds. Create a confidence interval at 90% confidence for the population mean μ.
Rockwell hardness of pins of a certain type is known to have a mean value of...
Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.4. (Round your answers to four decimal places.) (a) If the distribution is normal, what is the probability that the sample mean hardness for a random sample of 13pins is at least 51? (b) What is the (approximate) probability that the sample mean hardness for a random sample of 42 pins is at least 51? You may need...
Question 3: Confidence Intervals: Each question is worth 7.5 marks - Total (15 marks) A. A...
Question 3: Confidence Intervals: Each question is worth 7.5 marks - Total A. A sample of 121 customers revealed that 65% of them would like to use on-line shopping facilities. Find a 90% confidence interval for the population proportion of customers who would like to use on-line shopping facilities. Page 3 of 7 B. Suppose we know that the population standard deviation is 3. We have a sample size of 64. We also have a sample mean of 35. Estimate...
Rockwell hardness of pins of a certain type is known to have a mean value of...
Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.4. (Round your answers to four decimal places.) (a) If the distribution is normal, what is the probability that the sample mean hardness for a random sample of 18 pins is at least 51? (b) What is the (approximate) probability that the sample mean hardness for a random sample of 45 pins is at least 51?
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT