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Assume that you want to use a 0.05 significance level to test the claim that paired sample data come from a population for which the mean difference is Ud = 0. Find (a) d-, (b) Sd, (c) the t test statistic, and the critical values.
Listed below are predicted high temperatures that were forecast before different days.
Predicted high temperature forecast three days ahead 79, 86, 79, 83, 80
Predicted high temperature forecast five days ahead 80, 80, 79, 80, 79
Generate three random observations from the uniform distribution between -10 and 40 by using the following random numbers:
What is the value of c for which there is 80% probability that a metal plate has a thickness with in the interval [4.3-c, 4.3+c]?
We assume that we have selected two independent random samples from populations having proportions p 1 and p 2 and that p-hat 1 = 800/1000 and p-hat 2 = 950/1000
Machine X test unit cost $3000 with beta=3 and theta=500, Machine Y test unit cost $2000 with beta=3 and theta=400. If the machines oil fixtures has life of 20 hrs, which machine goes to market first?
The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 96 pounds. A random sample of 50 newly manufactured cables has a mean breaking strength of 1950 pounds.
Jim's average delivery time was 38 minutes whereas Alison's average delivery time was 40 minutes. The respective standard deviations were 5 minutes and 4 minutes.
Find the probability that exactly six tickets are written on a randomly selected day from this distribution.
Compute the value of t. What is your decision regarding the null hypothesis?
Public health statistics indicate that about 26.4% of Americans smoke. Suppose a random sample of 50 people is selected. Approximate the distribution of the same proportion with the normal model.
Write down the differential equations which describe the probabilistic behavior of the unit in time as a Markov process.
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
The National Turkey Association wants to experiment with three different feed mixtures for very young turkeys. Since no experience exists regarding the three mixtures, no assumptions can be made about the distribution of weights.
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