A normally-distributed population has a mean μ = 74 and a standard deviation σ = 11. For a set of samples of size 8 taken from this population, what is the z-value for the proportion of the sample...

A normally-distributed population has a mean μ = 74 and a standard deviation σ = 11. For a set of samples of size 8 taken from this population, what is the z-value for the proportion of the sample...

The weight of the eggs produced by a certain breed of hen is normally distributed with mean 64.5 grams (g) and standard deviation 5.9 g. If cartons of such eggs can be considered to be SRSs of size...

For a normal distribution with mean μ = 81.2 feet and standard deviation σ = 12.4 feet, find the 16th percentile.

First digit 1 2 3 4 5 6 7 8 9 Proportion 0.303 0.175 0.114 0.083 0.058 0.057 0.034 0.033 0.143 Fake records usually have fewer first digits 1, 2, and 3. What is the approximate...

on my modified box plot, quarter 2 and 3 are both 6. How would this be graphed?

A manufacturer of light bulbs says that its light bulb have a mean life of 700 hr and a standard deviation of 120 hr. You purchased 144 of these bulbs with the idea that you would purchase more if...

normal distributions and finding the standard deviation

I calculated a percentage and I need to find out the error of that percentage. Example: Percentage difference is 10%. How do I find out the plus or minus error? So get something like this "0...

If two fair dice are rolled, find the probability of the following result. A double, given that the sum was 11.

I'm having a little trouble with this

1. What is the probability that 5 messages are received in an hour? 2. What is the probability that less than 3 messages are received in half an hour?

a combination lock consist of 26 letters of the alphabet. If a 3 letter combination is needed, find the probability that the combination will be ABC in that order. The same letter can be used more...

In a recent year, 8,420,717 male students and 2,782,246 female students were enrolled as undergraduates. Receiving aid were 63.2% of the male students and 65.1% of the female students. Of those receiving...

it is claimed that the % of people who will vote for candidate A is 48%. Suppose in a random sample of 410 registered voters 194 said they would vote for candidate A. With a level of significance...

In a Harris Poll of 412 HR professionals, 85.3% said that the job applicants appearance is most important for a good impression. Construct a 94% Confidence Interval for the True population proportion...

SS = 120 and score or (n) is 30. how do I compute the standard deviation with no individual scores. Variance is 4.14

A private investigator found out that he only have one in seven chance in recovering stolen property. His out-of-pockets expenses for the investigation are 7000 pesos. He will only be paid if he recovers...

1. Find the sample size needed to estimate the percentage of republicans among registered voters in California. Use a 0.03 margin of error; use a confidence level of 90%.

I don't know what equation to use to solve this or what to plug into my calculator

For goodness of fit: 1. A normally-distributed population is a common assumption for most statistical tests. Using z-scores, the proportion of scores between given values is known, and these proportions...

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