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One hundred School children spent the day at Wally World, a poplar amusement park. Parents gave each child $20 for food, with orders to return the unspent funds at the end of the day. The lemon-lime gelato at the concession stand is quite popular with children, and, in fact, the children found no other item of food worth buying. A survey conducted on the bus on the way home revealed that children bought a mean of 2.3 gelatos, with a standard deviation of 0.6 gelatos. If a gelato sells for $2.50, find the sample mean and sample standard deviation for the amount of unspent money returned at the end of the day.
At a computer manufacturing company, the actual size of computer chips is normally distributed with a mean of 1 centimeter and the standard deviation of 0.1 centimeter. A random sample of 12 computer chips is taken. What is the possibility that th..
State the null and the alternative hypotheses. Using the p-value approach, test to determine whether or not the mean age of all employees is significantly more than 40 years.
Last school year, student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classificati..
What is the distribution of sample means.
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
For each of the following problems, assume that the homogeneity of variance assumption has not been met and that you will need to use the adjusted Welch statistic.
Following sample data shows the weekly closing price of ABC stock. Compute the sample mean and variance from this data set.
Eighty-eight shoppers were interviewed at random, and 59 said that they prefer to shop alone.
Compare 2 moving averages using MSE and compute Exponential smoothing. The subsiquent data which represents demand for company ABC's products for the last 10 months.
In a normal frequency distribution, 32% of the cases:
What is the probability that a particular driver has two speeding violations.
Organize data into a frequency distribution. How many classes would you propose? What value would you propose for class interval?
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