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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.
Of 880 respondents, 171 admitted that at least one light had been red. Follow four-step process to create 95% confidence interval.
Determine the 95% prediction interval for the overall rating of an individual notebook computer with a $1000 street price, a performance score of 100, and a 2.50-hour battery life.
MAT 540 Statistical Concept for Research. Actuaries work with statistics and probabilities each day. What do actuaries do and what tests do they take
Two tools that are often used in this process are the contingency table and the decision tree. What are these tools and how to they help us to make decisions under uncertainty when we are dealing with probabilities?
In a poll of 150 randomly selected adults 78 said they favored a new proposition. compute a 95% confidence interval for the proportion of all adults in favor of the proposition at the time of the poll.
Determine the probability that the student is Male. Do the same for student attending a Private high school. Use proper event notation remember that A is Female and B is Public - Calculate the probability that at least either the student is Female ..
the life in hours of a magnetic resonance imagining machine mri is modeled by a weibull distribution with parameters
Rock from quarry #9 is not suitable for rock needed in quarry #5. Minimize travel needed accomplish all the rock removals and replacements
Describe the context of the data set. Cite a previous description if the same data set is used from a previous assignment. To increase formal tone of the DAA, avoid first-person perspective "I." For example, do not write, "I ran a scatter plot sho..
Reilly Global Communications (RGC), Inc., sells communications systems to companies that have worldwide operations. Over the next year, RGC will be instituting important improvements in its manufacturing operations.
How do I construct an example where I would be able to apply the concept of expected value to a problem (e.g. a financial investment problem would be a great way to demonstrate how various stocks in a portfolio produce a weighted average of the ov..
a test is made of h0 u 69 versus h1 u 69. a sample size n 72 is drawn and x 70. the population standard deviation is
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