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A smartphone company has to decide which battery they will use for their upcoming model. Two battery manufacturers A and B are competing to get the contract. 15 smartphones of the upcoming model were tested with batteries from A. The dataset of talktime on a single charge for them has a sample mean of 7.2 hours and sample variance of 2.7. 31 smartphones of the upcoming model were tested with batteries from B. The talktime on a single charge for them has a sample mean of 6.8 hours and sample variance of 2.9. Assume that the talktime on a single charge for batteries made by A and B are Normal random variables. Based on this information, answer the following two questions.
(a) Compute a point estimate for difference in average talktime of battery A and battery B.
(b) Test whether the battery produced by A results in longer talktime, on average, than battery produced by B. Choose level = 5%.
in the past the standard deviation of weights of certain 32.0-oz packages filled by a machine was 0.25 oz. a random
A researcher estimates an AR(1) model with an intercept and finds that the OLS estimate of Beta1 is 0.95, with a standard error of 0.002.
suppose you flip a fair coin 10 times and it results in 1 tail and 9 heads. if you toss that coin again what is the
testing the difference between two means. note please respond to one 1 of the following two 2 bulleted itemswhat two
Design a recording form for behavior and explain how you would use this form to gather data on this behavior. What equipment would you need to collect data?
the following data lists the average monthly snowfall for january in 15 cities around the us26 6 5 45 44 10 39 33 15 33
The arrivals of new telephone calls at a telephone switching office is a Poisson process N(t) with an arrival rate of λ = 4 calls per second. An experiment consists of monitoring the switching office and recording N(t) over a 10-second interval.
a certain disease is found in one person in 5000. if a person does have the disease the test will show a positive
Suppose that 30% of all small businesses are undercapitalized. Forty percent of all undercapitalized small businesses fail and 20% of all small businesses that are not undercapitalized fail. A small business is chosen at random. The probability th..
Using excel create two histograms with a vertical scale in percents for the 1950 and 2075 population data. Insert the histograms into a word document and discuss the main features of each histogram and compare and contrast them
A random sample of 20 patients in a weight loss clinical trial lost an average of 25 pounds over an 8 week period. The sample standard deviation is 10.
Let X1,..., Xn be a random sample from the uniform distribution f(x) = 1/2, 0 ≤ x ≤ 2. Find the probability density function for the range R = (X(n) - X(1)).
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