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Current weekly demand forecast for an item follows a normal distribution with a mean of 100 units, with a standard deviation of 70 items. It takes one week to receive the order.
What is a measure of dispersion of random variable values about the expected value.
An inspector correctly identifies defective products 90% of the time. For the next 10 products, the probability that he makes fewer than 2 incorrect inspections is 0.736.
Statistics is a method of decision making in the face of uncertainty and the basis of numerical data and calculated risk. comment and explain with suitable illustration.
A normal distribution has a mean of 500 and a standard deviation of 50. A manager wants to simulate one value from this distribution, and has drawn the number 1.4 randomly. What is the simulated va
Drywall is used to construct walls in houses and offices. Consequently, the president decides to develop a regression model in which the dependent variable is monthly sales of drywall (in hundreds o
Y denotes price, in thousands of dollars, rounded to the nearest thousand. For part (g), predict the price of a 2600 sq ft home in the Equestrian Estates.
A radio manufacturer claims that 65% of teenagers 13 to 16 years old have their own portable radios. A researcher wishes to test the claim and selects a random sample of 80 teenagers.
At a large university it is known that 40% of the students live on campus. The director of student life is going to take a random sample of 200 students. What is the probability that more than half
Suppose that a recipient of a Nobel Prize in science between 1901-2003 is selected at random. Find the probability that the Nobel Laureate is from Japan.
A researcher believes that the percentage of people who exercise in California is greater than the nation exercise rate. the national rate is 20%. The researcher gathers a random sample of 120 indiv
a. Compute the coefficients of the regression line. b. Interpret the coefficients.
An examination of rejects shows at least 7 problems. A frequency tally of the problems follows. Construct a Pareto chart for these data.
For each class interval of the frequency distribution given, determine the class midpoint, the relative frequency, and the cumulative frequency.
To make this determination 600 people were classified in one of the three weight classes and then asked to select the most comfortable seat. The results are summarized in the following table.
The following data represent the costs (in dollars) of a sample of 30 postal mailings by a company. Using dollars as a stem and cents as a leaf, construct a stem-and-leaf plot of the data.
The frequency distribution is shown. For each class of the frequency distribution, determine the class midpoint, the relative frequency, and the cumulative frequency.
What is the probability that the participant will select exactly four white beads? What is the probability that the participant will select exactly four red beads?
Winning the jackpot in a particular lottery requires that you select the correct four numbers between 1 and 33 and in a separate drawing you must select the correct single number between 1 and 15.
The observed mean for the sample of 16 observations was found to be 203 mg. Calculate the "p-value" associated with this sample statistic. Based on the stated hypotheses, what do you conclude?
Six percent have both an American Express card and a Visa card. What is the probability of selecting a family that has either a Visa card or an American Express card?
calculate the exact probability of this arrangement occurring by chance assuming that males and females are equally likely to be promoted. Test the hypothesis that males are significantly more like
Show that if X and Y are independent Poisson random variables with parameters λ1 > 0 and λ2 > 0, then
Obtain the Normal Equivalent Deviates corresponding to the observed values of X and use these to produce a Q-Q plot. Does your plot indicate that these data are consistent with coming from a Normal
What is the probability of randomly selecting a member of the traveling public and finding out that he says that flight selection is not influenced by perceptions of airline safety and he wants to