A student wished to use a table of areas for the standard normal curve to find the z-score having an area to its right of 0.52. The student started by looking for the closest area to 0.52 in the body...
A student wished to use a table of areas for the standard normal curve to find the z-score having an area to its right of 0.52. The student started by looking for the closest area to 0.52 in the body...
salaries of 42 college graduates who took a statistics course in college have a mean of $ 66,000. Assuming a standard deviation of $ 14,816, construct a 99% confidence interval for estimating the...
In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 90% confident that your sample mean is within...
First use the range rule of thumb to make a rough estimate of the standard deviation of those scores. Possible scores range from 100 to 1200. Use technology and the estimated standard deviation to...
What is the number of four-period centered moving averages of a time series with 20 time periods?
Scores on a particular intelligence test are essentially normal with mean of 100 and standard deviation of 20. I have a statistics final today and im lost on how to solve this. I need a step by step...
does more data points improve your chances of finding a statistically significant difference
The mean daily snowfall amounts for whoville in Dec is 25 in and the standard deviation is 1.5 in assuming the data is normally distributed how many days would you expect the daily snowfall to be...
suppose that the distribution of scores on an exam is closely described by a normal cure with mean 100. the 16th percentile of this distribution is 80. what is the 84th percentile?
Suppose that 16% of the population of the U.S. is left-handed. If a random sample of 130 people from the U.S. is chosen, approximate the probability that at least 20 are left-handed. Use the normal...
A student takes a 15-question, true/false exam and guesses on each question. Find the probability of passing if the lowest passing grade is 12 correct out of 15. Would you consider this event...
I have the following problem and can't figure it out. A mileage test is conducted for a new car model, the “Pizzazz.” Thirty random selected Pizzazzes are driven for a month and the...
Use following data : 1,3,4,5,6,7,4,3,2,5 . Assuming normailty, find out the confidence interval for Mu at alpha=.05, where Mu is population mean.
this is a homework question about measures of variation, and im very confused.
This is a probability question and there are several more like this one
Salaries of postgraduates The Economics of Education Review (Vol. 21, 2002) published a paper on the relationship between education level and earnings. The date for the research were obtained...
Can you guys please help me with this question? Thanks The population proportion is 0.70. From a sample of 100 items, what is the probability of getting a sample proportion of more...
A die is rolled 50 times. Find the mean, variance, and standard deviation of the number of 3s that will be rolled
In a normal distribution, find ? when ? =110 and 4.56% of the area lies to the
Full time Ph.D students receive an average salary of $12,837 per year. If the salaries are normally distributed with a standard deviation of $1500, find the following probabilities: a. The...