The opera house has 2000 seats. there are 1200 seats on the main floor and 800 in the balcony. 40% of those in the balcony buy a program while 50% of people on the main floor buy a program. on opening...
The opera house has 2000 seats. there are 1200 seats on the main floor and 800 in the balcony. 40% of those in the balcony buy a program while 50% of people on the main floor buy a program. on opening...
A psychologist wishes to estimate the mean IQ of students at one college. He picks a random sample of 49 students from the college, measures each student's IQ, and obtains the following 95% confidence...
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...
Use the Confidence Interval formula above and calculate the 95% confidence interval for any population mean of your choice. Write down (invent) the sample size (be sure it is 30 or above), the sample...
The wall street journal surveyed 1,200 employees nation wide on the internet use at work. According to the survey 900 acknowledged surfing non-work related sited. set up a 95% confidence interval...
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...
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...
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...
What is the number of four-period centered moving averages of a time series with 20 time periods?
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?
Hello, I'm really struggling with how to approach this problem. Thank you for any advice. *Edited Original Question* Sorry.....you are absolutely correct in that...
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...
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...
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
What is the number of degrees of freedom associated with the t-test, when data are gathered from a matched-pairs test with 20 pairs? a. 18 b. 19 c. 20 d. 38