Prob and Stats
posted by Statistics help! .
Einstein claims that his true average quiz score is 90. You have sample data on 25 of his quizzes. The average for that samaple is 83, and the standard deviation for the sample (s) is 4. The alpha for this twotailed test is 0.05. Provide the calculated tvaule, the critial tvalue, and corresponding confidence interval around the sample average
Respond to this Question
Similar Questions

Stats
A random sample of 30 women drank an average of 15 cups of coffee per week during examination finals, with the sample standard deviation equal to 3 cups. A upper limit of an approximate confidence interval with 95% of the population … 
Math
An instructor gives regular 20point quizzes and 100point exams in a mathematics course. Average scores for six students, given as ordered pairs (x,y) where x is the average quiz score and y is the average test score, are (18, 87), … 
Estimating Using Confidence Intervals
An investor wants to determine the true average yield on a selection of investments from the Business week 1000. Suppose the investor draws a random sample of (n=40 firms) and finds an average yield on investment of (xbar = 5.00%) … 
gre math prob of a sample
sample standard deviation = 3 sample mean = 68 n=30 what is the probability that one student selected at random from the sample will have a height within one sample standard deviation of the sample mean? 
Probability and Statistics
For questions 1 5 use confidence intervals to test the hypothesis. 1) A light bulb producing company states that its lights will last an average of 1200 hours with a standard deviation of 200 hours. A sample of 100 light bulbs from … 
Stats
the average placement test score of a sample of 64 students out of 1000 registered at a community college is 70 with a standard deviation of 15. Construct a confidence interval with a 5% chance of error. 
ap stats
two different sections of electricians took their state license test. the first section consisted of 75 applicants having an average score of 262 and a sample standard deviation of 35. they were journeyman, experienced electricians … 
stats
On a test of motor coordination, the population of average bowlers has a mean score of 24, with a standard deviation of 6. A random sample of 30 bowlers at Fred's Bowling Alley has a sample mean of 26. A second random sample of 30 … 
Prob/Stats
determine the average savings balance on a particular day. error of tolerance is 50. what is the minimum number of accounts he must sample to construct a 95% confidence interval. the standard deviation is 350 
Math
Suppose there is a quiz in your mathematics class every week. The value of each quiz is 50 points. After the first 6 weeks, your average mark on these quizzes is 36. a) What average mark must you receive on the next 4 quizzes so that …