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From a population of cereal boxes marked "12 ounces," a sample of 16 boxes is selected and the contents of each box weighed. The sample revealed a mean of 11.7 ounces with a standard deviation of 0.8. Test to see if the mean of the population is at least 12 ounces. Use a 0.05 level of significance. (may use traditional or p-value method)
If there are 500 students in the school, what is the probability that everyone will pass the exam?
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
The point estimate for the difference between the proportions is:
Assume the population standard deviation (s) is 0.5 and the sample size (n) is 100. Calculate the values for alpha, a type I error and beta, a type II error. (To calculate Beta, consider a mean that is 1 standard error away from the lower end valu..
Out of 1000 people surveyed, 600 belonged to urban areas and rest to rural areas. Among 500 who visited other states , 400 belonged to urban areas. Test 5 % level of significance whether area and visiting other state are dependent.
Calculate the 90% confidence interval about μ if sample size, n, is 55. How does increasing sample size affect margin of error, E?
Analysis of variance- One way classification - Are there differences among these 3 drugs with respect to how long they are retained in the body?
Assume that a random variable, x, is distributed according to a normal distribution with mean 12 and standard deviation 2. Find the z-value if:
I want to estimate within $10 the mean salary of all graduates who were business majors in college. How many business majors would be needed to estimate the mean salary to within 10 with 95% confidence if the population standard deviation is $200.
Find the regression equation and percentage of variance and test whether the equation is significant portion of the variance.
Recent studies have shown that the super-cooling temperature of terrestrial frogs frozen at -6°C has a relative frequency distribution with a mean of - 2°C and a standard deviation of 0.3°C (The first of these studies was reported in Science, May ..
Prepare a frequency distribution from data given below that describes how long it took a person to drive to work in work week.
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