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The diameter of a spindle in a small motor is supposed to be 5 millimeters with a st.dev. of 0.04 mm. If the spindle is either too small or too large, the motor will not perform properly. The manufacturer measures the diameter in a sample of 10 motors and finds the average to be 5.04 mm. Does the manufacturer have significant evidence ( alpha = .01) that the shipment of motors is defective?
1. Define the population, variable, and parameter you will use.
2. State the hypotheses. State the level of significance.
3. Name the test.
4. Conduct the test giving statistics, the test statistic and the P-value. ( Show your work )
5. Write a conclusion that answers the question.
6. Find a 95% confidence interval.
7. What type of error could we have made in our conclusion?
In a large section of statistics class, the points for the final exams are normally distributed with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule.
Computing the Z scores for the given data and evaluate µ and σ for the population.
bachelor's degrees; and of 75 male nurses, 34 had bachelor's degrees. If a nurse is selected at random, and the probability that the nurse is? A female nurse with a bachelor's degree.
Describe the data appear the strength of the relationship among variables is sufficient to warrant using linear regression forecasting.
Likert scale- based questionnaire & responses for 30 respondents showing the number of respondents for each respond option
If the alpha level is changed from a = .05 to a = .01, (a) What happens to the boundaries for the critical regions? (b) What happens to the probability of a type I error?
In a recent year grade 8 Washington State public school students taking a mathematics assessment test had a mean score of 276.1 with a standard deviation of 34.4. Possible test scores could range from 0 to 500. Assume that the scores are normally dis..
Use an ANOVA with α=.05 to determine whether there are any significant differences among the three treatment means. (both by hand and in PASW), for the hand version of problem.
You are given an annual time series with 40 consecutive values and asked to fit a fifth-order autoregressive model.
A mean of 54 and a standard deviation of 5; the N(54, 5) distribution. What is the relative frequency of classical CDs with a playing time of X of 59 minutes?
Create a 95% confidence interval for proportion of highly educated women who left careers for family reasons and who wish to return to work.
questiona jonka tries to connect to his internet service provider. the probability that he connects on any single
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