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Let X be a normally distributed random variable with x= 100 and n= 10. Find the probability that X is between 70 and 120. (Round your answer to the nearest whole number percent.
Describe a normal distribution. What two parameters determine its location and shape and what proportion of trucks can be expected to travel between 80,000 and 120,000 kilometres in the year?
The number of loads of laundry washed per month was tracked for women and men living in college dorms.
Acme Airlines flies airplanes that seat 12 passengers. From experience, they have learned that, on average, 80% of the passengers holding reservations for a particular flight actually show up for the flight. If they book 13 passengers for a flight, w..
Consider the following test of whether a coin is fair. Toss the coin five times. If the coin lands either all heads or all tails, reject Ho: p= 1/2. (The p denotes the chance for the coin to land on heads.) Complete parts a and b. (a) What is the pr..
Independent-Samples t Test with SPSS In your research, you may find that you must compare the means of two samples related to one particular variable. For example, you may have population samples from two ethnic groups that you wish to compare agains..
Suppose the returns of a particular group of mutual funds are normally distributed with a mean of 12.4 and a standard deviation of 4.7%. I f the manager of a particular fund wants his fund to be in the top 5% of funds with the highest return, what re..
What are the possible values of this random variable and draw the density function.
Construct the 95% confidence interval estimate of the mean number of migraine attacks for those treated with acupuncture.
Has there been a statistically significant change in the mean length of the bars?
State the null hypothesis for the non-oil-dependent/oil-dependent comparison. Calculate the difference between the means of the democracy scale for non-oil-dependent and oil-dependent countries, Calculate the standard error of the difference. Calcula..
Rework problem 16 in section 4.1 of your text, involving drawing calculators from a box of working and broken calculators. Assume that the box contains 15 calculators: 13 that work and 2 that do not work. A sample of 5 calculators is selected and a r..
Explain the difference between a normal Distribution and a binomial distribution. How do we know which one to use?
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