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Safeway stocks national brands of coffee, as well as its own house brand. Consider a single randomly selected customer purchasing coffee and let "success" = the customer purchases a national brand. Assume p = 0.75, and that customers make coffee purchase decisions independently of one another. Also, assume that X = number among 20 randomly selected coffee purchasers who select a national brand, and that the random variable X follows the binomial distribution.
a. What is the probably that at most 15 customers choose a national brand?
b. What is the probability that exactly 15 customers choose a national brand?
c. What is the probability that at least 12 customers select a national brand?
d. Calculate the mean (i.e., the expected value) and the variance of the random variable X.
Explain probability distribution of X (name and parameters).
At 0.05 level of significance, is there evidence of significant relationship between age group and where people mainly get their news? If so, describe the relationship.
There is thought to be a relationship between a persons' educational attainment and the number of children he or she has. The hypothesis is that as one's educational level increases, he or she has fewer children.
Calculate separate confidence intervals for the numbers of days absent for Clinic A and Clinic B, respectively.
Biggio's Department Store has six employees available to assign to four departments in the store: home furnishings, china, appliances, and jewelry.
The KW water is provided to approximately 750,000 people, who are served through more than 362,000 accounts. All accounts are metered and billed monthly.
At.01 level of significance, is proportion of seeds which germinate dependent on seed type?
To see if his belief is substantiated, conduct the test at a suitable significant level. State the assumptions made. see if his belief is substantiated, conduct the test at a suitable significant level. State the assumptions made.
While it can't be denied that advertising impacts sales, it is also true that advertising is expensive and companies want to advertise in ways that have the greatest benefit for the amount of money spent.
The following frequency table summarizes the ages of 100 shoppers at the local grocery store. Compute the sample variance and standard deviation for this data set. Please show your work in Excel.
Using α = .05 test for significance differences among the population mean wasted time for theses three urban areas. What is the p-value? What is your conclusion?
10 cartons are taken at random from an automatic filling machine.The mean net weight of the carton is11.8 kg and standard deviation of 0.15kg. Does the sample mean differ significantly from the intended weight of 12kgs?
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