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A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spend studying per week. Based on a simple random sample, they surveyed 140 students. The statistics showed that students studied an average of 19 hours per week with a standard deviation of 14 hours. What is the probability that a sample mean would exceed 19 hours per week?
The U.S. Department of Transportation defines an airline flight as being "on-time" if it landed less than 15 minutes after the scheduled time shown in the carrier's Computerized Reservation System.
for each research situation described below decide what statistical procedure would most likely be used to answer the
q1. the hours of study and the final exam grades have this type of relationshipy 7.35hours 34.62.based on this linear
The statistical research was done primarily through the internet from governmental regulated sources. Estimates were used in consideration of absence of actual information.
A statistics instructor collected data on the time it takes the students to complete a test. The test taking time is uniformly distributed within a range of 35 minutes to 55 minutes.
you interview 100 people about who their favorite rock band is. of those 100 80 replied that their favorite band is
A marketing firm asked a random set of married and single men as to how much they were willing to spend for a vacation. At = .05, is a difference in the two amounts?
A salesman must select 2 of the first component and 3 of the second to take on a sales call. How many different systems can the salesman select?
how many students are enrolled in a course either in calculus discrete mathematics data structures or programming
a manufacturer knows that their items have a normally distributed lifespan with a mean of 3.1 years and standard
Use empirical Rule to evaluate proportion of costs within 2 standards deviations of mean. Write down these limits.
A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of µ = 80 and a standard deviation of σ = 20. The researcher expects a 12 point treatment effect and plans to use a ..
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