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Researchers want to see if letting factory workers listen to music will affect productivity. The population in this factory produces a mean of μ = 100 niblits per hour with a σ = 10. The managers of this factory choose one worker to listen to music through headphones for a week. After a week they produce 112 niblits per hour.
Population 1:
Population 2:
Research Hypothesis:
Null Hypothesis:
To convert the sample score to Z score use: Z = (X - M) / SD
Sample Z- Score: Z=
Is this a one tailed or two tailed hypothesis?
I want to be sure that my result can only happen 5% of the time if the null hypothesis is true. Use the Z-table to find out what the cutoff should be.
Cutoff Z-Score: Z=
Decision:
Interpretation:
Would you be concerned about the results for aspirin having been unduly influenced by the fact that most of the aspirin-takers were also nonsmokers? Explain.
What is the difference between a null hypothesis and an alternative hypothesis? Is the null hypothesis always the same as the verbal claim or assertion that led to the test? Why or why not?
Evaluate a test statistic for the null hypothesis H0: μ = 30 against the two-sided alternative hypothesis H1: μ _= 30, and by plotting this on its reference distribution, identify and calculate the corresponding p-value associated with H0. What ar..
A confidence interval for the population mean tells us which values of mean are plausible (those inside the interval) and which values are not plausible (those outside the interval) at the chosen level of confidence.
Copying times average 8 minutes according to an exponential distribution. What are the operating characteristics for this system?
ZODIAC SIGNS There are 12 signs of the Zodiac: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces.
Explain the difference between the information given by the tests of statistical significance t and Chi Square, and measures of association Cramer's V, Gamma and Pearson's correlation coefficient, r.
a study of math 1530 students on the first day of class asked the question how many pairs of shoes do you own?here is
For each of the following situations, assume that X is a binomial random variable with the specified n and p, and find the requested probability.
Is there any evidence to suggest the proportion of people who complete the puzzle within the allotted time has increased? Use a = 0.001.
Draw the histogram for these data using an initial class boundary of and a class width of . Note that you can add or remove classes from the figure. Label each class with its endpoints.
The purpose of the study is to predict the GPA scores of 2nd year graduate students at hofstra university. The survey has been conducted from the 15 2nd year graduate students. The data set consists of six variables namely ‘Individual responses'
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