Which of the following are suitable null hypotheses. If not, explain why. a. Comparing two groups...

Which of the following are suitable null hypotheses. If not, explain why.

a. Comparing two groups

Consider comparing the average blood pressure of a group of subjects, both before and after they are placed on a low salt diet. In this case, the null hypothesis is that a low salt diet does reduce blood pressure, i.e., that the average blood pressure of the subjects is the same before and after the change in diet.

b. Classification.

Assume there are two classes, labeled + and -, where we are most interested in the positive class, e.g., the presence of a disease. H₀ is the statement that the class of an object is negative, i.e., that the patient does not have the disease.

c. Association Analysis

For frequent patterns, the null hypothesis is that the items are independent and thus, any pattern that we detect is spurious.

d. Clustering

The null hypothesis is that there is cluster structure in the data beyond what might occur at random.

e. Anomaly Detection

Our assumption, H₀, is that an object is not anomalous.

Solutions

Expert Solution

PLEASE like me solution

milcah answered 10 months ago

Next > < Previous

Related Solutions

A) Formulate both null and alternative hypotheses for the client, and explain why the hypotheses need...

A) Formulate both null and alternative hypotheses for the client, and explain why the hypotheses need to be directional or non-directional. B) Determine what statistical test should be used to analyze the data. C) Summarize all information used to determine the correct statistical test (e.g., number of groups, type of data collected, independent or repeated measures) D) Provide a sample size and critical values in relation to the hypothesis. E) State what statistical test should be used (be specific since...

One tail or two tail test and why. Null and alternative hypotheses. Type of test and...

One tail or two tail test and why. Null and alternative hypotheses. Type of test and why. Critical values at .05 and .01 levels. Include df, if needed. Compute test Accept or reject null (Remember to include level if reject.) English conclusion (as we do in class). 16. People are selected to serve on juries by randomly picking names from the list of registered voters. The average age for registered voters in the country is μ = 39.6 years. A...

For the following statements, state the null and alternative hypotheses and identify which represents the claim....

For the following statements, state the null and alternative hypotheses and identify which represents the claim. Determine when a type I or type II error occurs for a hypothesis test of the claim. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed, and explain your reasoning. Explain how you should interpret a decision that rejects the null hypothesis. Explain how you would interpret a decision that fails to reject the null hypothesis. a. It is reported that the number...

For each of the following tests of hypotheses, determine whether the null hypotheses should be rejected....

For each of the following tests of hypotheses, determine whether the null hypotheses should be rejected. Use the classical method by finding the lower xL and upper xU limits for two-tail tests (or one of the two for a one-tail test). Additionally, don't forget to use a t-value (rather than a z-value) when n<30. A) Ho: µ = 6,000 Ha: µ ≠ 6,000; n = 70; x = 6,150; σ = 2,600; α = .01 B) Ho: µ = 50...

For each of the following: a) state the null and alternative hypotheses &n

For each of the following: a) state the null and alternative hypotheses b) state the type I & type II errors c) state the consequences of each error d) is one more serious? Explain. 1) You have created a new manufacturing method for producing widgets which you claim will reduce the time necessary for assembling the parts. Currently it takes 75 seconds to produce a widget. The retooling of the plant for this change is very expensive...

Comparing two groups. Identify a situation in your field of work (which is education) that might...

Comparing two groups. Identify a situation in your field of work (which is education) that might call for the use of a t test for two samples. Which test will be used (independent or dependent)? Justify your choice, and of course clearly identify the variables (independent and dependent).

Which of the following statements likely would include information to produce null and alternative hypotheses statements...

Which of the following statements likely would include information to produce null and alternative hypotheses statements for a potential study? A. Green plants exhibit enough light B. Green plants exhibit enough light for photosynthesis C. Green plants do not exhibit a high rate of growth when planted close to light. D. Green plants do exhibit high rates of growth. Please explain any option you choose.

Write down the null hypothesis. Write down the alternative hypothesis. Explain why you chose your hypotheses...

Write down the null hypothesis. Write down the alternative hypothesis. Explain why you chose your hypotheses as such. Do a hypothesist test of your data at the α = 2% level of significance for the population proportion by carrying out the following five steps: View an example of how to use StatCrunch to compute the value Zα If it is a left-tailed test, what is the critical value, -z0.02? If it is a right-tailed test, what is the critical value,...

Following to questions answer the following: - Provide the null and alternative hypotheses with the appropriate...

Following to questions answer the following: - Provide the null and alternative hypotheses with the appropriate symbols. - The significance level of the test. If it is not given use a significance level of 0.05. - The P-value for the test. State whether you reject or fail to reject the null hypothesis. In other words, compare the P-value to the significance level to decide whether to reject or fail to reject the null hypothesis. Question 1: The body mass index...

State the null and alternative hypotheses for each of the following situations. (That is, identify the...

State the null and alternative hypotheses for each of the following situations. (That is, identify the correct number μ0 and write H0:μ=μ0 and the appropriate analogous expression for Ha.) A. The average July temperature in a region historically has been 74.5°F. Perhaps it is higher now. B. The average weight of a female airline passenger with luggage was 145 pounds ten years ago. The FAA believes it to be higher now. C. The average stipend for doctoral students in a particular discipline at...

Subjects