Question

Probability and Statistics Could you please solve the following questions with specifying the answers A. The...

Probability and Statistics

Could you please solve the following questions with specifying the answers

A. The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal with mean 266 days and standard deviation 16 days. About 68% of all pregnancies last between

a. 250 and 282 days          b. 234 and 298 days           c. 218 and 314 days      d. 250 and 266 days

B. The distribution of actual weights of chocolate bars produced by a certain machine is approximately Normal with mean 8.2 ounces and standard deviation of 0.1 ounces. What proportion of chocolate bars weigh under 8 ounces?

a. 13.5%       b. 34%        c. 16%       d. 2.5%

C. Sixteen weighings of a small object on a sensitive scale result in 5.15 grams 4 times, 5.35 grams 4 times, 5.20 grams, 4 times and 5.30 grams 4 times, 16 total. If the standard deviation σ of weighings on this scale is .8 grams, what is an approximate 95% confidence interval for the true weight of the object?

  1. 5.25 ±.4         b. 5.25 ±.2        c.  5.25 ±.8       d.  5.20 ±.2
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
Probability and Statistics Could you please solve the following questions with specifying the answers A. When...
Probability and Statistics Could you please solve the following questions with specifying the answers A. When would you use a t-test rather than a z-test? a. when you need to use the standard deviation of a small sample   b. when the mean is very large   c. when you want the confidence interval to be narrower B. Twenty-five weighings of a small object on a sensitive scale result in average of 8.23 grams. If the standard deviation σ of weighings on...
Probability and Statistics Could you please solve the following questions with specifying the answers A. If...
Probability and Statistics Could you please solve the following questions with specifying the answers A. If a baseball batter gets a hit 31% of the time, what is the probability his first hit occurs on his fourth time at bat?   22.7%       b. 10.2%     c.  14.7%    d.  7.1% B. A dog can pass through one of three doors, A, B and C. If the dog is six times as likely to go through A as B, and it is three times as likely to go through...
Probability and Statistics Could you please solve the following questions with specifying the answers A. Is...
Probability and Statistics Could you please solve the following questions with specifying the answers A. Is the distribution of incomes in the US described by a normal distribution with μ equal to the mean income? Yes    b. No    c. Not enough information B. The weights of baby orangutans has standard deviation 4 pounds. How large a sample of baby orangutans is necessary for the 95% margin of error to be .5 pounds? a. 144      b. 324      c. 256   d. 900 C. A car manufacturer says...
Probability and Statistics Could you please solve the following questions with specifying the answers A. The...
Probability and Statistics Could you please solve the following questions with specifying the answers A. The weights of the boys in a city are normally distributed with μ = 85 pounds and σ = 6. What is the probability three randomly selected boys all weigh 73 pounds or less? 3(.025)        b. 3(.16)        c. (.025)3 d.(.135)3 B. If in a sample of 1600 voters, 56% favor candidate A and the remaining 44% favor B, what is a 95% confidence interval for the percentage...
Can someone please explain these questions. I don't understand how you can solve this without knowing...
Can someone please explain these questions. I don't understand how you can solve this without knowing standard deviation. 1. A New York real estate firm tracks the cost of apartment rentals in the US. In mid-2002, the nationwide mean apartment rental rate was $895 per month (The Wall Street Journal, July 8, 2002). Have apartment rates increased since then? A sample of 50 apartment rental rates from 2004 resulted in a calculated t statistic of 1.12. Based on this, with...
Instructions: Write probabilities to four decimal places (percentages to two decimal places). Draw bell curves to...
Instructions: Write probabilities to four decimal places (percentages to two decimal places). Draw bell curves to illustrate each desired areas. Use the correct probability notation (e.g. P(X >12.5) = P(z > 1.2) …. Use the Standard Normal Distribution Table to answer Questions 1 & 8). 1. The total blood cholesterol levels in a certain Mediterranean population are found to be normally distributed with a mean of 160 milligrams/deciliter (mg/dL) and a standard deviation of 50 mg/dL. Researchers at the National...
Java question, Please answer everything. Thank you Answer the following questions as briefly (but completely) as...
Java question, Please answer everything. Thank you Answer the following questions as briefly (but completely) as possible: What is a checked exception, and what is an unchecked exception? What is NullPointerException? Which of the following statements (if any) will throw an exception? If no exception is thrown, what is the output? 1: System.out.println( 1 / 0 ); 2: System.out.println( 1.0 / 0 ); Point out the problem in the following code. Does the code throw any exceptions? 1: long value...
The data below give the weights in ounces of randomly-selected bars of bath soap produced by...
The data below give the weights in ounces of randomly-selected bars of bath soap produced by two different molding machines. Weights (ounces) Machine 1 11.4 12.4 12.1 11.8 11.8 11.7 12.3 12.0 11.8 Machine 2 13.0 12.4 12.4 12.1 12.3 12.1 12.5 12.0 12.1 The question of interest is whether these two molding machines produce soap bars of differing average weight. The computed test statistic was found to be -2.75. Find the approximate P-value for the this test assuming that...
1.You plan to randomly select 10 students from your campus and ask them how many minutes...
1.You plan to randomly select 10 students from your campus and ask them how many minutes they exercised in the past seven days. The distribution of values taken by the average exercising time in all possible samples of size 10 is the (a) probability distribution of exercising times. (b) sampling distribution of average exercising times. (c) variance of the exercising time values. (d) population parameter. Use the following to answer Questions 2-4. A researcher cross-classified 386 trout into groups based...
Question 5: Assume that you make candy bars; the advertised weight of the candy bar is...
Question 5: Assume that you make candy bars; the advertised weight of the candy bar is 4.0 ounces with a standard deviation (sigma) of 2.35 oz. however your production manager thinks that this is not true; he thinks the candy bars are over-weight, they weigh more than 4.0 oz. To test his claim, you decided to randomly select a sample of 126 candy bars, the average weight (x-bar) is 4.5 oz. At an alpha (a) of 0.01 what do you...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT