# Posts by stat

Total # Posts: 42

**Stats**

Employees in a large company are entitled to 15-minute water breaks. A random sample of the duration of water breaks for 10 employees was taken with the times shown as: 12, 16, 14, 18, 21, 17, 19, 15, 18, and 16. Assuming that the times are normally distributed at the 5% ...

*May 10, 2015*

**science**

Thank you stat001 I used it just for check up, and it really helps, bnecause its important for me, as for many others. But I would like to say, that the someone who gives wrong answers by your nickname - it's not HE or SHE - IT, IT and even not schizophrenic, because ...

*August 24, 2013*

**science**

2. so The power of the test in Problem 1 is ____________%.

*August 24, 2013*

**science**

will be problem 1 is the write in the problem 2

*August 24, 2013*

**science**

A coin will be tossed 15 times, and I have to decide whether it lands heads with chance 0.6 or 0.3. I’ll test the hypotheses Null: p = 0.6 Alternative: p = 0.3 1. First, I will use a simple decision rule: if fewer than half the tosses are heads, I will choose p=0.3; if ...

*August 24, 2013*

**science**

thanks

*August 24, 2013*

**science**

A statistician analyzing a randomized controlled experiment has tested Null: The treatment does nothing. Alternative: The treatment does something. using a 4% cutoff for P-values. The P-value of the test turns out to be about 1.8%. 1. The conclusion of the test is -The ...

*August 24, 2013*

**science**

A statistician analyzing a randomized controlled experiment has tested Null: The treatment does nothing. Alternative: The treatment does something. using a 4% cutoff for P-values. The P-value of the test turns out to be about 1.8%. 1. The conclusion of the test is -The ...

*August 24, 2013*

**Statistics**

A statistician analyzing a randomized controlled experiment has tested Null: The treatment does nothing. Alternative: The treatment does something. using a 4% cutoff for P-values. The P-value of the test turns out to be about 1.8%. 1. The conclusion of the test is -The ...

*August 24, 2013*

**Statistics**

thanks . for other question answer is click both the options

*August 17, 2013*

**Statistics**

and what's the answer ? If the two variables were independent, the expected number of foreign gas/electric hybrids would be estimated to be _______. (Please keep at least two decimal places)

*August 17, 2013*

**Statistics**

what's the answer? If the two variables were independent, the chance that a sampled car is a domestic gasoline fueled car would be estimated to be about 0.0362 0.0499 0.2775 0.3820 0.5

*August 17, 2013*

**Statistics**

thanks

*August 17, 2013*

**Statistics**

what's the answer? Under the null, the expected number of plants in Category D is ______.

*August 17, 2013*

**Statistics**

There are two boxes, each with several million tickets marked “1” or “0”. The two boxes have the same number of tickets, but in one of the boxes, 49% of the tickets are marked “1” and in the other box 50.5% of the tickets are marked “1...

*August 1, 2013*

**Statistics**

True or False Question: A die is rolled 600 times. The face with six spots appears 112 times. Is the die biased towards that face, or is this just chance variation? Answer the question in Problem 6. 6) “The test concludes that the die is biased towards the face with six ...

*July 29, 2013*

**Statistics**

Multiple Choice: A die is rolled 600 times. The face with six spots appears 112 times. Is the die biased towards that face, or is this just chance variation? Answer the question in the steps outlined in Problems 1-6. 3) If the null hypothesis were true, the expected number of ...

*July 29, 2013*

**Statistics**

Multiple Choice: A die is rolled 600 times. The face with six spots appears 112 times. Is the die biased towards that face, or is this just chance variation? Answer the question in the steps outlined in Problems 1-6. 2) The alternative hypothesis is a) The die is biased b) The...

*July 29, 2013*

**Statistics**

Multiple Choice: A die is rolled 600 times. The face with six spots appears 112 times. Is the die biased towards that face, or is this just chance variation? Answer the question in the steps outlined in Problems 1-6. 1) The null hypothesis is: a) The die is biased towards the ...

*July 29, 2013*

**Chemistry**

I am working a question...... I am not sure how to go about solving this or working it out. The class is online. Can some explain how to go about doing this. Thank you greatly :) How much heat does your body lose when 2.60g of sweat evaporates from your skin at 25C? (Assume ...

*March 21, 2013*

**Chemistry**

Considering the following precip reaction Pb(NO3)2(aq)+2KI(aq)----->PbI2(s)+2KNO3(aq) What is the correct net ionic equation? I think it is 2NO3+^-+2K^+---->2KNO3

*February 27, 2013*

**Chemistry**

A solution containing 0.100 mol of Na2CO3 and 0.100 mol of NiCl2 is allowed to react. What mass of precipitate forms in this reaction? I think I know how to do it but don't understand. Do I figure out the mass of each of the compounds? HELP please!!!

*February 25, 2013*

**statistic**

nevermind above question, this question please: Suppose there are three balls in a box. On one of the balls is the number 1, on another is the number 2, and on the third is the number 3. You select two balls at random and without replacement from the box and note the two ...

*January 12, 2012*

**Statistics**

A researcher conducts a t test for dependent means in which it is predicted that there will be a decrease in unemployment from before to after a particular job-skills training program. The cutoff "t" needed is -1.8333. The standard deviation of the distribution of ...

*October 6, 2009*

**Statistics**

A research article included the following table: Mean Score on Four Questionnarie Scales Before and After the Experimental Manipulation. Questionnaire Before After Change Dominance 18.42 16.31 -2.11 Independence 17.25 21.38 4.13** Conformity 18.97 17.20 -1.77* Nurturance 16.11...

*October 6, 2009*

**Statistics**

A researcher conducts a t test for dependent means in which it is predicted that there will be a decrease in unemployment from before to after a particular job-skills training program. The cutoff "t" needed is -1.8333. The standard deviation of the distribution of ...

*October 6, 2009*

**Statistics**

A school counselor tests the level of depression in fourth graders in a particular class of 20 students. The counselor wants to know whether the kind of students in this class differs from that of fourth graders in general at her school. On the test, a score of 10 indicates ...

*October 6, 2009*

**Statistics**

A researcher interested in relationships developed a questionnaire that measures the degree of affection adult men feel for their fathers. She has found that for the general population the distribution is skewed to the right, the mean degree of affection is 60, and the ...

*October 6, 2009*

**Statistics**

A researcher interested in relationships developed a questionnaire that measures the degree of affection adult men feel for their fathers. She has found that for the general population the distribution is skewed to the right, the mean degree of affection is 60, and the ...

*October 6, 2009*

**statistics**

What is a great topic to do a research paper on and apply statistics?

*October 5, 2009*

**ststistics**

A researcher conducts a t test for dependent means in which it is predicted that there will be a decrease in unemployment from before to after a particular job-skills training program. The cutoff "t" needed is -1.8333. The standard deviation of the distribution of ...

*October 5, 2009*

**statistics**

A research article included the following table: Mean Score on Four Questionnarie Scales Before and After the Experimental Manipulation. Questionnaire Before After Change Dominance 18.42 16.31 -2.11 Independence 17.25 21.38 4.13** Conformity 18.97 17.20 -1.77* Nurturance 16.11...

*October 5, 2009*

**statistics**

A research article included the following table: Mean Score on Four Questionnarie Scales Before and After the Experimental Manipulation. Questionnaire Before After Change Dominance 18.42 16.31 -2.11 Independence 17.25 21.38 4.13** Conformity 18.97 17.20 -1.77* Nurturance 16.11...

*October 5, 2009*

**statistic**

A researcher conducts a t test for dependent means in which it is predicted that there will be a decrease in unemployment from before to after a particular job-skills training program. The cutoff "t" needed is -1.8333. The standard deviation of the distribution of ...

*October 5, 2009*

**statistics**

A school counselor tests the level of depression in fourth graders in a particular class of 20 students. The counselor wants to know whether the kind of students in this class differs from that of fourth graders in general at her school. On the test, a score of 10 indicates ...

*October 5, 2009*

**statistics**

A research article included the following table: Mean Score on Four Questionnarie Scales Before and After the Experimental Manipulation. Questionnaire Before After Change Dominance 18.42 16.31 -2.11 Independence 17.25 21.38 4.13** Conformity 18.97 17.20 -1.77* Nurturance 16.11...

*October 5, 2009*

**statistics**

A researcher interested in relationships developed a questionnaire that measures the degree of affection adult men feel for their fathers. She has found that for the general population the distribution is skewed to the right, the mean degree of affection is 60, and the ...

*October 5, 2009*

**statistics**

A researcher interested in relationships developed a questionnaire that measures the degree of affection adult men feel for their fathers. She has found that for the general population the distribution is skewed to the right, the mean degree of affection is 60, and the ...

*October 5, 2009*

**Stat**

Remeber that it is areas under a density curve, not the height of the curve, that give proportions in a distribuiton. To illustrate this, sketch a density curve that has its peak at 0 on the horizontal axis but ahs greater area within .25 on either side of 1 than within .25 on...

*September 21, 2009*

**stat**

ok there was a question that my teacher told me i got wrong the question asked me to compute the mean which I did... then the question went on to tell me compute the mean with another observation equal to zero then the part that he drew the line through was my response to this...

*September 6, 2009*

**trig**

hmmmm ok i\'ll try and see what i get thanks

*September 6, 2009*

**trig**

that would be the image i put up... i don\'t understand???

*September 6, 2009*

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