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

Why do so many womens lives seem to be divided between

Why do so many women's lives seem to be divided between working for money or goods, and homemaking during the period 1800-1860?

Statistics for decision making assignment-statistical

Statistics for Decision Making Assignment- Statistical Concepts: Probability Binomial Probability Distribution Calculating Binomial Probabilities - Open a new Excel worksheet. 1. Open spreadsheet 2. In cell A1 type "succ ...

Two players compete against each other in a game of chance

Two players compete against each other in a game of chance where Player A wins with probability 1/3 and Player B wins with probability 2/3. Every time Player A loses he must pay Player B $1, while every time Player B los ...

A discrete-time linear filter has a unit pulse

A discrete-time linear filter has a unit pulse response   The input to this filter is a random sequence with uncorrelated samples. Show that the output PSD is real and non-negative.

In a certain lottery six numbers are randomly chosen from

In a certain lottery, six numbers are randomly chosen from the set   (without replacement). To win the lottery, a player must guess correctly all six numbers but it is not necessary to specify in which order the numbers ...

A gambler plays a game of chance where he wins 1 with

A gambler plays a game of chance where he wins $1 with probability and loses $1 with probability 1-P each time he plays. The number of games he plays in an hour,N , is a random variable with a geometric PMF  (a) What is ...

Assignment query optimisation this assignment aims to

Assignment: Query Optimisation This assignment aims to develop your skills optimizing query. It involves identifying the suitable methods for structuring the data and writing the query. First, you will need to create a q ...

A random sample of 9 ti-89 titanium calculators being sold

A random sample of 9 TI-89 Titanium calculators being sold over the internet had the following prices, in dollars. 135,163,152,153,138,164,160,149,157 Assume the population standard deviation is σ+28 and that the populat ...

Let xt and yt be two jointly wide sense stationary gaussian

Let X(t) and Y(t) be two jointly wide sense stationary Gaussian random processes with zero-means and with autocorrelation and cross-correlation functions denoted as    Determine the cross-correlation function between

Instructions 1 this assignment is a group assignment you

Instructions 1. This assignment is a group assignment. You are required to work in groups of 2-3 students per group. Groups will be decided by your lecturer. 2. Refer to the data that corresponds to your campus and group ...

  • 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

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate