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In a large retirement community, 60% of households have no dogs, 30% have one dog, and 10% have two dogs. Following a news story about how the elderly have trouble walking their dogs in the winter weather, a magnanimous group of teenagers decides that it will randomly select two households in the retirement community each and call and offer to walk their dog(s). For each teen who participates, T is the total number of dogs in the two households called.
a. List all possible values for T.
b. Find the sampling distribution for T. (Hint: This is simply a list of possible values for T and their probabilities.)
c. If there are no dogs in the two households (T = 0), the teen starts over with a new sample of two households. If 1000 teens participate, for about how many of them will T = 0 for their first sample?
Obtain descriptive statistics and graphic displays for these salt-taste indices. Do the indices appear to be normally distributed? Why or Why not? Compute the sample mean for this index, and obtain 95% CIs about the point estimate.
Which class had the highest mean score?- Which class had the highest median score?- For which class are the mean and median most different? Which is higher? Why?
An article in the Asia Paci?c Journal of Management discusses the importance for ?rms to invest in social ties.8 A company is considering paying $150,000 for social activities over one year, hoping that productivity for the year will rise.
What is a sampling distribution, and what are the uses of sampling distributions?- A sample of size n = 5 is selected from a population. Under what conditions is the sampling distribution of X‾ normal?
(a) Find the range. (b) Find the variance. (Give your answer correct to two decimal places.) (c) Find the standard deviation. (Give your answer correct to two decimal places.)
h-p is said to be the leading seller of pc's in the U.S WITH 27% share of the pc market. if a researcher selects 130 recent pc purchases
1. the following table displays the salaries of 20 workers per week210 209 212 208 217 207 210 203 208 210210199 215
Predict the average age difference in 2015.- Describe reasons why you might not place much faith in that prediction.
Find the probability that the time taken for a randomly chosen customer to be dealt with by a cashier is more than 180s.
Which is a possible value for the correlation of X and Y in the a) -0.75 b) 0 c) +1 d) +0.98
What name was given to modern stamps from 1967 onwards because of the sculptors cameo bust of the queen?
The lead time is 2 weeks.If you were asked to create an (R,s,S) policy for this, what parameters would you pick? Give your reasons.
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