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Question: The physical fitness score for a population of police officers at a local police station is 72, with a standard deviation of 7 on a 100-point physical endurance scale. Suppose the police chief selects a sample of 49 local police officers from this population and records a mean physical fitness rating on this scale equal to 74. He conducts a one-sample z test to determine whether physical endurance increased at a .05 level of significance
(a) State the value of the test statistic and whether to retain or reject the null hypothesis.
(b) Compute effect size using Cohen's d.
Analyze the above output to determine the multiple regression equation. Find and interpret the multiple index of determination (R-Sq). Perform the multiple regression t-tests on?ˆ1,?ˆ2 (use two tailed test with (a = .10). Interpret your results
If the principal wants to be 50% certain the bus system will break even, approximately what monthy transportation fee should he charge?
Suppose that Y is normally distributed with mean 0 and unknown variance σ2. Then Y2/σ2 has a χ2distribution with 1 df. Use the pivotal quantity Y2/σ2 to find a a. 95% confidence interval for σ2.
Could the interval be used to estimate the mean amount of time a 9-year-old American spends eating & drinking each day. Explain.
Suppose that you want to set up a statistical test to challenge the claim of 6.7 seconds. What would you use for the null hypothesis?
a researcher measures the extent to which years of marriage predict perceptions of forgiveness. which factor is the
Solve different inventory control problems using an appropriate OR method.
a professor would like to utilize the normal distribution to assign grades such that 5 of students receive as. if the
in a sample of 80 workers from a factory in city a it was found that 8 were unable to read while in a sample of 50
An element E has a constant failure rate (lamda) and a reliability at time t of R(t)=p, if p=0.2 and 0.8, What is the effect on Rs(t), and basic reliability, serial MTBF, of adding additional elements to the series baseline system containing a sin..
Show that the new process is not a Poisson process, e.g., by computing its generating function, or by computing the mean and the variance (which are equal for the Poisson distribution). Find (nevertheless) the probability that the first occurrence..
Calculate and post your 'answers' or interpretations of (a little bit of a review of the fundamental concepts): The three Measures of Center (Mean, Median, and Mode).
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