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From extensive records, it is known that the duration of treating a disease by a standard therapy has a mean of 15 days with a standard deviation of 3 days. It is claimed that a new therapy can reduce the treatment time. To test this claim, the new therapy is tried on 70
patients, and their average treatment time is calculated to be 14.6 days.
Calculate the standard normal distribution value for the 97% confidence level [3]
Test the claim supported at a 97% confidence level [9]
Indicate the P-value for this test in (c). [4]
We want to estimate the population mean within 5, with a 99% level of confidence. The population standard deviation is estimated to be
2. How large a sample is required?
a sports league is making up their season schedule. the league has 12 teams with eight teams from la and the rest from
A bag contains 8 red marbles, 2 blue marbles, and 1 green marble. What is the probability of choosing a marble that is not blue?
33 on WSPD (channel 13). At the .05 significance level, is there a difference in the proportion of viewers watching the three channels?
Develop a p chart with 3-sigma control limits and evaluate whether the process is in statistical control
I want to know whether the StdError of the fitted score (SEYhat) can be legitimately interpreted normally for N=1 subject, with only one plotted Y score for each X value.
The "Top Three" at a racetrack consists of picking the correct order of the first three horses in a race. If there are 10 horses in a particular race, how many "Top Three" outcomes are there?
A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and for men. At = .05, what is the test v..
Roberta scored in the 85th percentile on a standardized test of reading ability. What is Roberta's associated z score?
the number of customers at quiet morning bakery is believed to follow a poisson distribution with a mean of 2 customers
What can we say about the probability distribution of x? Is it approximately normal? What are the mean and standard deviation?
i. how many strings of ten digits length can be formed using only the digits 12345? digits may be used more than once
Imagine you are the CEO of a local bank whose credit card holders engage in 1 billion credit card transactions per year; that the likelihood of a fraudulent transaction is 2%
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