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The X column indicates the number of client contact last month, and the Y column shows the value of sales ($ thousand) last month for each client sampled. Find the coefficient of correlation:
This continues, with the winner always playing the waiting player, until one of the players has won two sets in a row. That player is then declared the overall winner. Find the probability that A
To help the Greasy Spoon restaurant manager target the correct age levels, you want to find if there is a statistically significant difference @ the 5% level between the age of the restaurant custo
A pistachio rancher buys a new fertilizer system that is supposed to increase the yield per acre. She uses the system for one year and notes the following output per acre: Calculate the Averag
A box contains 20 DVDs , 4 of which are defective. If two DVDs are selected at random without replacement from this box what is the probability that both are defective?
Explain the difference between a one sample and a two sample hypothesis test; provide an example of each.
At the 5% level of significance, can we infer that the population mean weight of athletic men is lower than the population mean weight of non-athletic men by more than 2 pounds?
Note: after 5o years of age both the mean and standard deviation tend to increase. What is the probability that for an adult (under 50 years old) after a 12 hour fast.
Purchasing manger is currently reordering whenever the inventory on hand is equal to twice as much as the safety stock level. Calculate the reorder point and achieved fill rate in this policy.
The company's policy is to provide 95% of the demand from the inventory on hand; they hold a safety stock of 42 units to provide this policy. (Use the approximations for service and backorder level
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.