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The null hypothesis and the alternate are:
H0: The cell categories are equal
H1: The cell categories are not equal
Category Observed
A 10
B 20
C 30
What is the critical value of the Chi-square? Compute the value of Chi-square. What is your decision regarding H0?
In a large section of statistics class, the points for the final exams are normally distributed with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule.
What effect has the transformation had on the lowest exam mark and what effect has the transformation had on the highest exam mark - STATS 201/8 Data Analysis
Assume that 5% of men and only .25% of women are colorblind. A colorblind person is chosen at random:
Let independent variable x represent years since 1950. Determine quadratic regression model for per capita cigarette consumption.
Eighty-eight shoppers were interviewed at random, and 59 said that they prefer to shop alone.
A previously used drug treatment has a mean remission time of 12.5 weeks. Does the data indicate that the mean remission time using the new drug is different from 12.5 week at a level of significance of 0.01?
A certain medication is known to increase the pulse rate of its users. The variance of the pulse rate is known to be 10 beats per minute.
The university police department must write, on average, five tickets per day to keep department revenues at budgeted levels. Suppose the number of tickets written per day follows Poisson distribution with a mean of 9 tickets per day.
Finding the probability of each event in a group of events of different possibility
A random variable X that has pmf given by p(x) = 1/ (n+1) over the range Rx = {0,1,2,...,n} is said to have a discrete uniform distribution. Find the mean and variance of this distribution.
Assume a one-tailed t -test is being applied to determine if population mean is less than $212. Level of significance chosen is 0.01 and 26 accounts are sampled. Determine the critical value?
Polls showed the two main candidates in 2004 presidential election were nearly tied on the day before the election. To predict the winner a newspaper would like to have a poll that has a margin of error of less than 1%.
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