Solution: Let X_bar be the average amount lost by a passenger, then X_bar is a normal random variable, with mean of $182, and standard deviation of $105/ .
165120 Find the confidence interval Find the confidence interval Amounts lost by gamblers who took a bus to an Atlantic City casino: 99% confidence; n = 40, = $189, and is known to be $87. Solution. You missed something.
13108 Estimating Number of Houses with Lost Power in Random Sample Estimating Number of Houses with Lost Power in Random Sample a.
The confidence Interval is given by
The human resources department of Western Electronics has studied the distribution of time lost due to absenteeism by individual employees.
In symbols: P(A or B) = P(A) + P(B) - P(A and B) Example A technology company wishing to market a new device contacts a random sample of its current customers to determine how many now use a pager or a cell phone.
The human resources department of Western Electric Corporation has studied the distribution of time lost from absenteeism by individual employees. During a one-year period the department found a mean of 21 days and a standard deviation of 10 days.
The sales manager is interested in finding out whether there is a difference in the mean amounts charged by customers on the three cards. A random sample of 18 credit card purchases (rounded to the nearest dollar) revealed the following amounts.
What statistical tool should be used for the following? Random sampling. What if population isn't normal?
I would use a simple random sample collecting data from both genders, then only use the data from the gender I am interested in studying. A subset of a simple random sample would also be random in this case.
, but in proportional amounts from each of those demographic groups.