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In a two-tailed hypothesis testing at significance level α of 0.05, the test statistic is calculated as 2. If P(X >2) = 0.03, then we have sufficient evidence to reject the null hypothesis.
the economy may be headed for recession. as the manager of a bank you would like to know the average income of the
let b and c be independent random variables uniformly distributed over 07 and 03 respectively. what is the probability
lauren plans to deposit 3000 into a bank account at the beginning of next month and 225month into the same account at
The hypothesis test produces a z-score of z = -2.60. Assuming that the researcher is using a two-tailed test, what is the correct statistical decision.
Determine a 95% confidence interval for the mean efficiency of a given batch of motors. If we want to cut the confidence interval by 1/3, how many motors should be tested?
the management of red cat computers was considering launching a new product called the tiger 100. the problem was that
A manufacturer claims that the mean lifetime, mu, of its light bulbs is 44 months. The standard deviation of these lifetimes is 7 months. Seventy bulbs are selected at random, and their mean lifetime is found to be 43 months.
Construct a times series plot. What type of pattern exists in the data and use trial and error to find a value of the exponential smoothing coefficient α that results in a relatively small MSE
Under what situations must the nonparametric test be used? Describe in detail. Write down the strengths and weaknesses of nonparametric tests?
Interpret the correlation between each set of variables.
The sampled results show that sample mean and standard deviation were $52.00 and $17.50, respectively. Use this information to create a 95% confidence interval for the mean.
a random sample of 121 checking accounts at a bank showed an average daily balance of 280. the standard deviation of
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