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The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 5400 miles. If the manufacturer guarantees the tread life of the tires for the first 53,520 miles, what proportion of the tires will need to be replaced under warranty?
1. state two ways in which the standard normal distribution and the students t-distribution are alike.2. state two ways
Is the chi-square distribution is a skewed distribution whose mean value is n for degrees of freedom larger than two?
The researcher also gathers data on age and major to see if there is any connection between these varibales and frequency of sexual harassment.
a group of statistics students decided to conduct a survey at their university to find the average mean amount of time
Explain how the null hypothesis is the basis of this calculation. Determine the value of the relevent test statistic and the corresponding p-value.
Find the area between z = -0.65 and z = 0.37, find the area to the right of z = 2.35
the probability that a university graduate will be offered no jobs within a month of graduation is estimated to be 5.
Develop a 95% confidence interval for the mean amount of household income for sub- scribers to Young Professional magazine. Interpret this interval.
Nyobia had a population of 3 million in 1985. Assume that this country's population is growing continuously at a 5% annual rate and that Nyobia absorbs 40000 newcomers every year.
What is a discrete random variable and how does it differ from a continuous random variable? Give examples.
A national survey is conducted to assess the association between hypertension and stroke in persons over 55 years of age. Compute the incidence of stroke in persons over 55 years of age
Is it necessary to assume a normal distribution on the population to estimate the value of the mean spending per day? Explain.
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