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If we have a standard deviation of 10 and a sample size of 25, what is the standard error of the mean?
A teacher decides to give a standardized test to her students to find out how much they know about stats before starting an introductory statistics course. The test has a mean score of 100 and the standard deviation of 20. Using this information, determine the percentile rank for students based on what percentage of students the student of interest did better than with the following scores.
a. Score of 80:
b. Score of 140:
A local pharmaceutical company wants to determine if the local community is or is not in favor of a public health care option. A recent poll indicates that 60% of the community is in favor of this plan. Given that the standard error is 1.2, construct a 95% confidence interval for this measurement including upper and lower limits. What can we conclude of this?
Now we will say that a later poll indicates 52% are in favor. We will say the standard error in this case is 2. If the z-score is 1.96, calculate a 95% confidence interval based on this new information.
MATH1550H: Assignment: Question: A word is selected at random from the following poem of Persian poet and mathematician Omar Khayyam (1048-1131), translated by English poet Edward Fitzgerald (1808-1883). Find the expected value of the length of th..
MATH1550H: Assignment: Question: what is the least number of applicants that should be interviewed so as to have at least 50% chance of finding one such secretary?
MATH1550H: Assignment: Question: Experience shows that X, the number of customers entering a post office during any period of time t, is a random variable the probability mass function of which is of the form
MATH1550H: Assignment:Questions: (Genetics) What is the probability that at most two of the offspring are aa?
MATH1550H: Assignment: Questions: Let’s assume the department of Mathematics of Trent University has 11 faculty members. For i = 0; 1; 2; 3; find pi, the probability that i of them were born on Canada Day using the binomial distributions.
Caselet on McDonald’s vs. Burger King - Waiting time
Generate descriptive statistics. Create a stem-and-leaf plot of the data and box plot of the data.
Problems on Sampling Variability and Standard Error and Confidence Intervals
Estimate the population mean
Conduct a marketing experiment in which students are to taste one of two different brands of soft drink
Find out the probability
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