Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Statistics and Probability Expert

problem1) Dullco Manufacturing claims that its alkaline batteries last at least 40 hours on average in a certain type of portable CD player. But tests on a random sample of 18 batteries from a day's large production run showed a mean battery life of 37.8 hours with a standard deviation of 5.4 hours. What would be the teststatistic to test DullCo's hypothesis?

problem2) What are the null and alternative hypotheses for the Dullco test?

problem3) In the Dullco ex, we would be performing what type of hypothesis test?

problem4) If α=.02, what would be the critical value for the Dullco test?

problem5) What is the risk of type I error if the U.S. military mobilizes troops to prepare for a missile attack from North Korea, but North Korea does not carry out an attack? Who will likely bear the costs of this error?

problem6) If a manager is told that there is possibly a safety issue related to a manufacturing process under their purview but decides not to run tests to detect the problem, what type of error is the manager exposed to?  What are the consequences of this type of error, and to whom?

problem7) If a research and development team is testing a new blood pressure medicine to see if it maintains patients’ average blood pressure at a significantly lower level than does the current industry standard, what sets of hypotheses would they use?

problem8) When do we make use of chi-squared tests and/or F-tests? In other words, what parameter do we want to know about, and which statistics are we using to make inferences about this parameter?

problem9) Which of the following statements is (are) true when we reject the null hypothesis?

a) The find outd value associated with our sample is extreme enough that we find it unlikely that this level of difference is merely due to chance.
b) We conclude that there is not enough difference in the sample for us to consider taking action.
c) The probability of a value as extreme or more extreme that the value we observed is smaller than the probability we chose as our “cutoff” point (the value at which we begin to conclude that there is a statistically significant difference).
d) Both a. and c. are correct.

problem10) Which of the following is true of paired T-tests?

a) One time they are used is when two samples are taken on the same individuals.
b) They are never used for “before and after” tests.
c) They are only used when σ2 is known
d) The paired t-test is preferred to chi-squared tests because it is more conservative.

problem11) If two CNC machine shops were competing for a contract to make rivets to a certain specification, what test would we use to test if there were differences in the variability of their products?

problem12) True or False? The degrees of freedom for the t-test used to compare two population means (independent samples) with unknown variances (assumed equal) will be n1 + n2 - 2.

problem13) True or False? The test statistic (F-find outd value) in an F test for equal variances is the ratio of the sample variances.

problem14) In a left-tailed test comparing two means with variances unknown but assumed to be equal, the sample sizes were n1 = 8 and n2 = 12. At α = .05, the critical value would be:

problem15) True or False? Alpha and beta can never be simultaneously reduced, even though that would be a desirable situation. describe your answer.

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M9637

Have any Question? 


Related Questions in Statistics and Probability

A researcher evaluates a gun training program in a large

A researcher evaluates a gun training program in a large American city found that rapes dropped by 90% in the year following the training. Researchers looking at the same data but expanding the time frame to include 5 ye ...

Recall that very satisfied customers give the xyz-box video

Recall that "very satisfied" customers give the XYZ-Box video game system a rating that is at least 42. Suppose that the manufacturer of the XYZ-Box wishes to use the 65 satisfaction ratings to provide evidence supportin ...

Its believed that as many as 20 of adults over 50 never

It's believed that as many as 20% of adults over 50 never graduated from high school. We wish to see if this percentage is the same among the 25 to 30 age group. a) How many of this younger age group must we survey in or ...

A smartphone company has to decide which battery they will

A smartphone company has to decide which battery they will use for their upcoming model. Two battery manufacturers A and B are competing to get the contract. 15 smartphones of the upcoming model were tested with batterie ...

1 what kind of variance does the mean square within-groups

1. What kind of variance does the mean square within-groups (MS wg ) reflect? 2. The sum of squares between-groups (SS bg ) reflects the degree to which the condition means vary around the __________.

1 a successive independent survey design and a longitudinal

1. A successive independent survey design and a longitudinal survey design both examine changes in responses over time. How do they differ in their approach? 2. Distinguish between demographic and epidemiological researc ...

How does the competitive success of ords kangaroo rat

How does the competitive success of Ord's kangaroo rat change in the absence of coyotes? Propose one possible cause for the decline in rodent diversity in the control areas after treatment begins. What is the impact of c ...

Jullian was curious if regular excise really helps weight

Jullian was curious if regular excise really helps weight loss,she decided to perform a hypothesis test. A random sample of 5 Kansas State students was chosen. The students took a 30-minute exercise every day for 6 month ...

A geologist collects hand-specimen sized pieces of

A geologist collects hand-specimen sized pieces of limestone from a particular area. A qualitative assessment of both texture and color is made with the following results. Is there evidence of association between color a ...

1 what is the minimum reliability coefficient that

1. What is the minimum reliability coefficient that researchers consider acceptable? Why do researchers use this minimum criterion for reliability? 2. For what kind of measure is it appropriate to examine test-retest rel ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen