Saturday

March 28, 2015

March 28, 2015

Total # Posts: 81

**statistics**

A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 395 babies were born, and 316 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the percentage of girls born. Based on the result, ...
*March 13, 2015*

**statistics/probability**

An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between 130 lb and 181 lb. The new population of pilots has normally distributed weights with a mean of 135 and a standard deviation of 25.1 lb. If a pilot is randomly ...
*March 12, 2015*

**statistics**

Determine whether the description corresponds to an observational study or an experiment. Research is conducted to determine if there is a relation between kidney function in adults and childhood-onset diabetes.
*March 10, 2015*

**statistics**

Based on a study of IQs of men and women who play chess competitively, a researcher concludes that playing chess causes people to become smarter. Do you agree with this conclusion?
*March 10, 2015*

**statistics**

An online site presented this question, 'Would the recent norovirus outbreak deter you from taking a cruise?' Among 34,327 people who responded, 66% answered 'yes'. Use the sample data to construct a 95% confidence interval estimate for the proportion of the ...
*March 9, 2015*

**Statistics**

In the week before and the week after a holiday, there were 12,000 total deaths, and 5916 of them occurred in the week before the holiday. a. Construct a 95% confidence interval estimate of the proportion of deaths in the week before the holiday to the total deaths in the week...
*March 9, 2015*

**Statistics**

What does p-hat mean
*March 8, 2015*

**statistics**

A coin mint has a specification that a particular coin has a mean weight of 2.5 g. A sample of 39 coins was collected. Those coins have a mean weight of 2.49491 g and a standard deviation of 0.01372 g. Use a 0.05 significance level to test the claim that this sample is from a ...
*March 7, 2015*

**statistics**

Suppose IQ scores were obtained from randomly selected twins. For 20 such pairs of people, the linear correlation coefficient is 0.876 and the regression line is y-hat = 11,76 + 0.89x, where x represents the IQ score of the twin born second. Also,the 20x values have a mean of ...
*March 7, 2015*

**math/statistics**

The data show the time intervals after an eruption (to the next eruption) of a certain geyser. Find the regression equation,letting the first variable be the independent (x) variable. Find the best predicated time of the interval after an eruption given that the current ...
*March 6, 2015*

**Statistics**

Identify the type I error and type II error that corresponds to the given hypothesis. The proportion of settled medical malpractice suits is 0.28 I have been working on this one for 3 hours and am doing something wrong, Please help!!
*March 6, 2015*

**statistics**

A survey found that women's heights are normally distributed with mean 62.4 in and standard deviation 2.8 in. The survey also found that men's heights are normally distributed with a mean of 68.9 in. and standard deviation 2.8. Complete parts a through c below. a. Most...
*March 5, 2015*

**Statistics/Probability**

what does SEm mean?
*March 5, 2015*

**Statistics/Probability**

A certain brand of candies have a mean weigh of 0.8576 g and a standard deviation of 0.0523. A sample of these candies came from a package containing 447 candies,and the package label stated the net weight is 381.3 g. (If every package has 447 candies, the mean weight of the ...
*March 5, 2015*

**Statistics/Probability**

Assume that women’s heights are normally distributed with a mean given by μ = 63.4 in, and a standard deviation given by σ = 2.3 in. (a) If 1 woman is randomly selected, find the probability that her height is less than 64 in. (b) If 43 women are randomly ...
*March 4, 2015*

**statistics/normal distribution**

Find the area of the shaded region.The graph to the right depicts IQ scores of Adults (85-120), and those scores are normally distributed with a mean of 100 and a standard deviation of 15
*March 4, 2015*

**Statistics Help**

Express the confidence interval (0.024, 0.112) in the form of p-hat – E < p < p-hat + E = __< p < __ I don't understand how to perform this formula. Please help I am about to graduate and this is my last class, and I am struggling as I only know basic Math...
*March 4, 2015*

**statistics/Help Please!!**

In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and the following results were obtained:0.18, 0.12, 0.05, 0.19, 0.18,0.13, 0.15. Assuming that this sample is representative of the cars in use, construct a 98% confidence interval ...
*March 4, 2015*

**statistics**

It says "Construct a 99% confidence interval estimate of the mean net change in LDL cholestorol after the garlic treatment. What does the confidense interval suggest about the effectiveness of garlic in reducing LDL cholestorol? What is the confidence interval estimate of...
*March 1, 2015*

**statistics**

In a test of the effectiveness of garlic for lowering cholesterol, 44 subjects were treated with garic in a processed tablet form. Cholesorol levels were measured before and after the treament. the changes in their levels of LDL cholestorol (in mg/dL have a mean of 3.5 and a ...
*March 1, 2015*

**Statistics/check answer**

If a population has a standard deviation σ of 18.2 units, what is the standard error of the mean if samples of size 25 are selected? Show all work. standard error of the mean = 0/sqrt(n) = 18.2/sqrt(25) = 18.2/5 =3.64 Answer 3.64
*March 1, 2015*

**statistics**

Determine the level of the confidence given the confidence coefficient z(α/2) for the following situation: z(α/2) = 1.96
*February 27, 2015*

**statistics**

For classes of 273 students, find the mean and standard deviation for the number born on the 4th of July, Ignore leap years. For a class or 273 students, would two be an unusually high number who were born on the 4th of July? I don't know how to find how many out of 273 ...
*February 27, 2015*

**statistics**

A headline in a certain newspaper states that "most stay at first job less than 2 years." That headline is based on an online poll of 320 college graduates. Among those polled, 72% stayed at their first full-time job less than 2 years. a. Assuming that 50% is the ...
*February 27, 2015*

**statistics**

Heights of men on a baseball team have a bell-shaped distribution with a mean of 169 cm and a standard deviation of 9 cm. Using the empirical rule, what is the approximate percentage of the men between the following values? a. 151 cm and 187 cm. b. 160 cm and 178 cm. Please ...
*February 26, 2015*

**statistics/normal distribution**

If np is greater than or equal to 5, and nq is greater than or equal to 5, estimate P(fewer than 8) with n =14 and p = 0.6 by using the normal distribution as an approximation to the binomial distribution; if np < 5 or nq < 5, then state that the normal approximation is ...
*February 25, 2015*

**statistics**

Heights of women have a bell-shaped distribution with a mean of 158 cm and a standard deviation of 8 cm. Using Chebyshev’s theorem, what do we know about the percentage of Women with heights that are within 3 standard deviations of the mean. What are the minimum and ...
*February 21, 2015*

**statistics**

A candy company claims that 13% of its plain candies are orange, and a sample of 100 such candies is randomly selected. Find the mean and the standard deviation for the number of orange candies in such groups of 100. I do not get the formula to figure this out Someone, please ...
*February 20, 2015*

**statistics**

Let the random variable x represent the number of girls in a family with three children. Assume the probability of a child being a girl is 0.42. The table on the right describes the probability of having x number of girls. Determine whether the table describes a probability ...
*February 20, 2015*

**statistics**

A brand has 50% recognition rate. Assume the owner of the brand wants to verify that rate by beginning with a small sample of 6 randomly selected customers, what is the probability that exactly 5 of the selected consumers recognize the brand name? I need the correct formula in...
*February 20, 2015*

**probabilities**

A brand name has 50% recognition rate. Assume the owner of the brand wants to verify that rate by beginning with a small sample of 6 randomly selected consumers. How would you do the binomial probability formula can be used to find the simple binomial probabilities for n = 6 ...
*February 19, 2015*

**statistics**

Let the random variable x represent the number of girls in a family with three children. Assume the probability of a child being a girl is 0.46. The table describes the probability of having x number of girls.Determine whether the table describes a probability distribution. If...
*February 18, 2015*

**statistics**

Five males with a particular genetic disorder have one child each. the random variable x is the number of children among the five who inherit the genetic disorder. Determine whether the table describes a probability distribution. If it does, find the mean and standard ...
*February 18, 2015*

**statistics**

A candy company claims that 11% of its plain candies are orange, and a sample of 200 such candies is randomly selected a. find the mean and standard deviation for the number of orange candies in such groups of 100. use the formulas below to calculate the mean and standard ...
*February 18, 2015*

**statistics**

Assume that a procedure yields a binomial distribution with n trials and the probability of success for one trial is p. Use the given values of n and p to find the mean μ and standard deviation σ. Also, use the range rule of thumb to find the minimum usual value &#...
*February 18, 2015*

**statistics**

S) Suppose we want to determine the (binomial) probability (p) of getting 5 heads in 15 flips of a 2-sided coin. Using the Binomial table in the appendix of the text, what values of n, x, and p would we use to look up this probability, and what would be the probability? n=...
*February 17, 2015*

**algebra**

For the quadratic function f(x) = - x^2 +2x + 6, find the vertex and the axis of symmetry, and graph the function. Again, I need help with this as these are practice examples for an upcoming quiz and I stink at this part of algebra and I need to get it otherwise I won't ...
*February 4, 2015*

**algebra**

Find the vertex and the axis of symmetry, and graph the function. f(x) = x^2 - 5x Graphing is not my strong point, I really need help with this. Thanks
*February 4, 2015*

**algebra**

Find the x-intercepts and y-intercepts for f(x) f(x)=x^2-4x + 1 I have been trying to figure this one out for hours and I find no solution but there has to be a way to figure this out and I can't. Please help!! Thank you
*February 4, 2015*

**algebra**

Multiply and simplify. Assume that no radicands were formed by raising negative numbers to even powers. √6x^3 * √18x^2 = √2 * 3 * x^3 * √2 * 3^2 * x^2 = √2 * 3x^2x * √2 * 3^2 * x^2 = 6x^2 * √3x Is this correct?? If not can you show me ...
*February 3, 2015*

**algebra**

Use the law of exponents to simplify. 5/6^12 * 2/9 I don't remember if the second fraction you do the reciprocal and I have not done one where the denominator has to the power of. Help!!
*February 3, 2015*

**algebra**

a store mixes red fescue worth $10 per pound and ryegrass worth $14 per pound. The mixture is to sell for $13 per pound. Find out how much of each should be used to make a 228-pound mixure
*January 13, 2015*

**algebra**

Translate to a system of equations but do not solve. One canned juice drink is 20% orange juice; another is 10% orange juice. How many liters of each should be mixed together in order to get 10L that is 13% orange juice? How many liters of the 20% orange juice should be in the...
*January 13, 2015*

**Criminal Law**

What do you know about the classification of criminal law?
*August 7, 2014*

**Criminal Law**

points of similarities between Federal and State Law.
*August 7, 2014*

**American Goverment**

What are the political issues in regards to Obamacare?
*August 5, 2014*

**American Government**

members of congress
*August 2, 2014*

**American Government**

Do the backgrounds of members matter in the legislative process?
*August 2, 2014*

**American Government**

What are the characteristics of American democracy? How does American democracy differ from the theory of democratic government?
*July 18, 2014*

**chemistry**

What is an example of a genetic disease that is caused by silent mutation?
*June 29, 2014*

**chemistry**

What is the chemical formula of ketohexose?
*June 15, 2014*

**chemistry**

How are cis trans isomers used for night vision?
*June 7, 2014*

**chemistry**

What are the differences between cis- and trans-isomers?
*June 7, 2014*

**chemistry**

What is the significance of atomic nuclear decay? What is your analysis on the societal implications of using this process?
*May 31, 2014*

**chemistry**

aspirin, Sodium bicarbonate, and Salicylic acid. From these examples, select one acid, one base, and one salt and describe specifically how and where they are used in therapeutic processes.
*May 24, 2014*

**chemistry**

Enzymes are a catalyst, which means that they make chemical reactions go faster. “How does a catalyst affect the activation energy of the reaction?
*May 18, 2014*

**chemistry**

Enzymes are a catalyst, which means that they make chemical reactions go faster. “How does a catalyst affect the activation energy of the reaction?
*May 18, 2014*

**chemistry**

What is the difference between biochemical, pharmaceutical, and diagnostic chemical reactions in healthcare? What is a specific example that exists for each of these chemical reaction types above and why might it be of importance to healthcare professionals? List a balanced ...
*May 16, 2014*

**chemistry**

what are three examples of a hypothesis? Or at least one....
*April 28, 2014*

**Introduction to Criminal Courts**

Analyze and explain the importance of a college degree for someone seeking to join the police or police training. Analyze and explain how higher education plays a pivotal role in advancement and promotions in the police department. Analyze whether higher education is pivotal ...
*March 27, 2014*

**English Comp**

What does Rhetorical or Rhetorical stance mean?
*February 22, 2014*

**speech (Writeacher)**

I'm trying to think of a good topic for my persuasive speech and with all I have going on my mind is a blank. I wondered if you had any good suggestions? I would greatly appreciate it. Thanks for all your help and you inspired me so with your story that it made me realize ...
*May 23, 2013*

**speech (Writeacher)**

Writeacher, in response I am doing my outline for an informative speech and I decided to choose the topic Why me? Dying to live or living to die. Everybody at some point will encounter some kind of diagnosis whether it be you, your spouse, a loved one and even a child, I did. ...
*May 21, 2013*

**speech**

Please help me. I need to write an informative speech. My husband has been sick for along time and needs a lung transplant (He is 52 and never smoked!) Any way I want to right a speech on how any one can over come a life crisis. It's just hard to think of something when ...
*May 21, 2013*

**writing**

What is the difference between a general purpose and a specific purpose? How can writing a clear specific purpose help you put together a more effective speech
*May 9, 2013*

**psychology**

what makes social psychology unique in terms of social science
*April 22, 2013*

**psychology**

What makes psychology a science????? and What are independent and dependent variables in regards to scientific research in psychology?????
*April 16, 2013*

**psychology**

Perceptions are linked to sensations. what happens when we get overloaded from our senses and how would that overload impact perceptions?
*April 14, 2013*

**psychology**

In the article "Conditioned emotional reactions" by John B. Watson and Rosalie Raynor., Explain the initial pairing of the bar and the rat in terms of learning through classical conditioning What are unconditional stimulus (US) conditional stimulus (CS) and ...
*April 9, 2013*

**psychology**

Mensa is a group for those who score within the top 2% on a standardized intelligence test. The group "provides a forum for intellectual exchange among its members.What do you think about a group of people who get together based on their intelligence?
*April 7, 2013*

**psychology**

Is addiction (Drug) a disease or a choice and why? Could it be possible that both apply according to scientific evidence
*March 31, 2013*

**psychology**

I am trying to find a good topic question and hypothesis for addiction. In my class we were asked to pick any topic related to psychology and find research to back it up. Addiction is a wide range of different behaviors and I can't seem to find a concrete answer. My first ...
*March 30, 2013*

**College Mathematics**

Does this look right if it is 0-9 26*26*10*10*10*10=6,760,000
*March 18, 2013*

**College Mathematics**

it said 9 digits 0-9
*March 18, 2013*

**College Mathematics**

Counting principles and permutations. A social security number consists of 9 digits. How many different social security numbers are possible if repetition of digits is permitted. digits 0-9
*March 18, 2013*

**College Mathematics**

U.S. Presidents. The ages of the 44 presidents at their first inauguration (as of 2011) are: 57 57 49 52 50 42 54 55 64 61 61 64 56 47 51 51 56 46 57 54 50 46 55 56 60 61 54 57 68 48 54 55 55 62 52 47 58 51 65 49 54 51 43 69 a. Construct a frequency distribution with a first ...
*March 18, 2013*

**College Mathematics**

Counting Principles and Permutation. A social security number consists of 9 digits. How many different social security numbers are possible if repetition of digits is permitted
*March 18, 2013*

**College Mathematics**

This is a repost. I posted a question 2 days ago and the response was wrong. The question was on Probability. The question was One card is selected from a deck of playing cards. Determine the probability of selecting a jack OR a club. use this rule P(A or B) = P(A) + P(B) - P(...
*March 12, 2013*

**College Mathematics**

Probability. Select one card. One card is selected from a deck of playing cards. Determine the Probability of selecting a Jack OR a club. P(AorB)= P(A) + P(B) - P(A and B)
*March 12, 2013*

**College Mathematics**

(odds) Playing Bingo:When playing bingo, 75 balls are placed in a bin and balls are selected at random. Each ball is marked with a letter and a number as indicated in the following chart: B: 1-15 I: 16-30 N:31-45 G:46-60 O:61-75. For example there are balls marked B1,B2 up to ...
*March 11, 2013*

**College Mathematics**

Probability: "or" and "and" problem. Select one card, one card is selected from a deck of playing cards. Determine the probability of selecting a jack or a club.
*March 10, 2013*

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