Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Solved Assignments
Asked Questions
Answered Questions
Please answer Which statistical test would be appropriate then carry out the test and evaluate the outcome at the .05 level and a nondirectional prediction.
Serum ferritin is used in diagnosing iron deficiency. In a study conducted recently researchers discovered that in a sample of 28 elderly men the sample standard deviation of serum ferritin was 52.6
Each participant's attendance is recorded for one quarter and the mean attendance days per group are calculated. Identify the independent and dependent variable and the population and sample.
Four machines were compared with respect to the mean length of a common product that they produce. Random samples of 5 units each were selected from the machines' production lines. When the test fo
Compute the probability mass function (pmf) of X, the number of corrupted files. Draw a graph of its cumulative distribution function (cdf).
An East Coast manufacturer of printed circuit boards exposes all finished boards to an online automated verification test. During one period, 900 boards were completed and 890 passed the test. The t
Two random variables X and Y have the joint distribution, P(0, 0) = 0.2, P(0, 2) = 0.3, P(1, 1) = 0.1, P(2, 0) = 0.3, P (2, 2) = 0.1, and P(x, y) = 0 for all other pairs (x, y).
Two dice are tossed. Let X be the smaller number of points. Let Y be the larger number of points. If both dice show the same number, say, z points, then X = Y = z. Find the joint probability mass fu
In order to estimate the reliability of a particular system, an analyst tests 100 computer components until they fail, and record their life lengths. How could the sample information be used to esti
Examine the values for the MAD and MSE in parts b and e. Which of the two forecasting techniques would you recommend the manager to use in order to forecast the number of new clients generated each
Find the 0-1 loss optimal predictor of y based on x. Evaluate the risk of your predictor in c)
Using the methods of joints, determine the force in each member of the truss shown. State whether each member is in tension or compression.
When considering given amounts of males and females who earn specific kinds of college degrees, there are three statistical events to consider. For each pair of events, please indicate if they are d
Determine the angles made by the vector V = (21)i + (61)j with the positive x- and y-axes. Write the unit vector n in the direction of V
10% of pregnant women deliver prematurely. An obstetrician is seening 16 pregnant women in his next clinic session.
Ten equally qualified marketing assistants are candidates for promotion to associate buyer; seven are men and three are women. If the company intends to promote four of the ten at random, what is th
Find both the optimal squared error loss and optimal absolute error loss predictors of y based on x. Evaluate the risk of the optimal squared error loss predictor.
A random sample of 400 was drawn from a normal distribution with astandard deviation of 5. The sample mean is 80. Determine the 95%confidence interval estimate of the population mean.
A person leaves for work between 8 am and 8.30 am and takes between 40 and 50 minutes to get there. Let the random variable X denote her time of departure and the random variable Y the travel time.
Describe and explain two alternatives to NHST. What do their proponents consider to be their advantages?
Independent variable: normal birth weight vs. low birth weight infants; dependent variable: 1 minute Apgar scores (1-10 scale). Independent variable: time of measurement (before, during, and after sur
Identify the population of interest to the psychology professor. Identify the sample. Does the study involve descriptive or inferential statistics? Explain.
For hartley's test: (a) state the hypothesis, (b) calculate the degrees of freedom, (c) find the critical value at the 5 percent level of significance, (d) calculate hartley's test statistic. (e) wh