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To determine the effect of advertising in the Yellow Pages, Bell Telephone took a sample of 40 retail stores that did not advertise in the Yellow Pages last year but did so this year. The annual sales (in thousands of dollars) for each store in both years were recorded.
a. Estimate with 90% confidence the improvement in sales between the two years.
b. Can we infer that advertising in the Yellow Pages improves sales?
c. Check to ensure that the required condition(s) of the techniques used in parts (a) and (b) is satisfied. d. Would it be advantageous to perform this experiment with independent samples? Explain why or why not.
Rhode Island Red Chickens the incubation time for Rhode Island Red chicks is normally distributed to find out the number of chicks we expect that will hatch.
Determine the probability of exactly one success given Poisson distribution with mean of 2.0.
Determine the oucomes in the sample space, and construct a probability distribution table. Find the expected value of the following game.
This problem related to Basic Statistics and it is about a study on the average wages of a fast food restaurant worker. The problem is about picking up a random worker whose salary is above the average wage
An American Society of Investors Survey found that 30% of individuals have used a discount broker. In a random sample of 9 individuals, what is the probability That:
a. Create a single index series for prices with Year 0 as the base year. b. Create a single index series for wages with Year 0 as the base year.
Can we conclude there is a difference in mean number of surgeries performed by hospital or by day of week?
some researchers in understanding g-loads on humans are interested in methods that can be used to assist pilots
If a sample of 30 people selected from 300, find the probability that the mean will be less than 156 pounds using the correction factor.
In a sample of 88 children selected randomly from one town, it is found that 8 of them suffer from asthma. Find the P value for a test of the claim that the proportion of all children in the town who suffer from asthma is equal to 11%.
(A) At the 0.05 level of significance, use the six step critical value approach to hypothesis testing to try and prove that the 2004 proportion has increased. (B) Use the 5 step p-value approach. Interpret the meaning of the p value.
Compute and interpret each of the statistics in parts(a) through (f) Mean and Median.
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