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Data are drawn from a bell-shaped distribution with a mean of 120 and a standard deviation of 5. There are 900 observations in the data set. Approximately how many observations are less than 130?
1. Calculate the value of 2. Find the probability density function for the random variable two different ways.
a polling company obtains an alphabetical list of names of voters in a precinct. they select every 20th person from
A town has 15 neighborhoods. If you interviewed everyone living in one particular neighborhood, would you be interviewing a population or a sample.
groupmeanstdevpopulation nmen51411280382women48510392420the cutoff for mathematics scores is 550. how many texas men
Determine the cutoff sample score at a significance level of 5%. Calculate a Zobt score. Compare the Zobt to the Zcrit
Assuming speed is distributed normally, calculate a 95 percent confidence interval for the population mean of miles per hour.
Write the null and alternative hypotheses. You want to see if the number of minutes cell phone users use each month has changed from its mean of 120 minutes 2 years ago.
engine capacity the engine in a 1957 chevrolet corvette has eight cylinders. each cylinder is a right cylinder with a
Develop a simulation model for this port. Compute such statistics as the average number of ships in port, the average number of days in port for a ship, and the percentage of idle time for each of the terminals
Does sample size make a difference? What assumptions do we need to make in using the t-distribution for the construction of a con?dence interval?
1.the weight of medium-sized oranges selected at random from a large bin of oranges at the local supermarket is a
Please describe the purpose for each of the three basic measures of variability and provide at least two examples for each.
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