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A television manufacturer is studying television remote control usage. One of the criteria they are measuring is the distance at which people attempt to activate the television set with the remote control. They have discovered that the activation distances are normally distributed with a mean distance of 6 feet and a standard deviation of 2.75 feet. If a remote's maximum range is 10 feet, what percentage of the time will users attempts to operate the remote outside of its operating limit?
According to the 1996 Statistical Abstract of the United States, 7.6% of the scores on the verbal portion of the Scholastic Aptitude Test (SAT) exceeded 600.
what is the probability that a randomly selected value from the distribution will be greater than 2.1 standard deviations avoe the mean?
Mean and standard deviation are 584.6 and 34.28
What is the distribution of sample means.
Use this information to develop a 95% confidence interval to estimate the production variance for the hourly wages of production workers in U.S. What is the value of upper limit of this confidence interval?
A large internet retailer is studying the lead time (elapsed time between the time when the order is placed and the time it is filed). The table below gives the lead times (in days) for a random sample of recent orders.
She believes that the number of customers served on weekdays follows a normal distribution. Construct an 99% confidence interval of the average number of customers served on weekdays.
Explain the meaning of the conditional mean of the dependent variable in the population regression function. Illustrate using an example.
A research analyst regresses the number of calls for service (Y) on the Fahrenheit temperature at 4:00 in the afternoon (X). The regression equation finds: Y = 62 + 2.4 X with an r 2 of .67
Compute average daily rainfall in the week and for weekends. Get the average of weekdays' rainfalls and average of weekend's rainfalls.
Why is effective sampling important when performing a hypothesis test? What could happen if your sample is not appropriate to your study?
Construct a 95% confidence interval for the population mean.
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