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In order to determine the average amount of unburned hydrocarbons pro duced by a particular brand of carburetor (adjusted in what is believed to be the optimal way), a random sample of 35 carburetors was taken, and the amount of unburned hydrocarbons recorded. The three largest and three smallest values were 1.7, 2, 4.1 and 7.9, 8.2, 9.3. The average amount was computed to be 5.7 with a sample standard deviation of 0.9. The manufac turer suspects that the distribution of unburned hydrocarbons is not nor mal.
(a) Construct an 88% confidence interval for the average amount of unburned hydrocarbons for the entire population of this brand of car buretor.
(b) Construct an 88% prediction interval for the amount of unburned hydrocarbons produced by the next carburetor tested.
(c) Construct an interval that with 90% confidence will cover 90% of the population.
a civil service exam yields scores which are normally distributed with a mean of 81 and a standard deviation of 5.5.
Determine a 95 % confidence interval for the iron concentration.
A sample of 81 account balances of a credit company showed an average balance of $1,200 with a sample standard deviation of $126. You want to determine if the mean of all account balances is significantly different from $1,250. Use a .05 level of ..
for the data set below if you were to fit a regression equation what would the value of r2 be to two decimals? hint
Preference to change blades is recorded. Do the data support the twin-blade manufacturer's claim? α=.05. This is a t-tests independent samples.
a new test was designed to have a mean of 80 and a standard deviation of 10. a random sample of 20 students at your
Discuss how a t test for a dependent variable can be of great value in applying a new approach to the treatment of aggressive behavior to a small group of students.
assume that a procedure yields a binomial distribution with a trial repeated n times. use the binomial probabilities
Determine the test statistic. Show all work; writing the correct test statistic, without supporting work, will receive no credit and determine the p-value. Show all work; writing the correct critical value, without supporting work, will receive no c..
1. What is the distinction between distribution-free methods and nonparametric methods?
With a mean of 696 grams and a standard deviation of 37 grams. If you pick one fruit at random, what is the probability that it will weigh between 573 grams and 619 grams.
question determine the probability of a normally distributed data point being in the ranges indicated in the following
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