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March 2, 2015

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

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statistics for managers
Several statistical tests have a way to measure effect size. What is this, and when might you want to use it in looking at results from these tests on job related data?
Thursday, January 30, 2014 at 10:14pm

Statistics
The per-store daily customer count (i.e., the mean number of customers in a store in one day) for a nationwide convenience store chain that operates nearly 10,000 stores has been steady, at 900, for some time. To increase the customer count, the chain is considering cutting ...
Thursday, January 30, 2014 at 9:34pm

Statistics
The per-store daily customer count (i.e., the mean number of customers in a store in one day) for a nationwide convenience store chain that operates nearly 10,000 stores has been steady, at 900, for some time. To increase the customer count, the chain is considering cutting ...
Thursday, January 30, 2014 at 9:32pm

public speaking
Mandy interviewed a source who told about how she was illegally treated by the police. using her information in the speech is an example of: a. facts and statistics b. narrative c. testimony d. hypothetical example i chose b
Wednesday, January 29, 2014 at 5:46pm

Statistics
WEB CALCULATOR EXERCISE Descriptive Statistics 1 The table below presents data for a sample of people who completed a religious survey. Age Gender Denomination Church Attendance 56 1 7 4 46 2 6 5 49 2 6 5 49 1 1 5 27 2 9 5 51 1 4 2 47 2 2 3 67 1 5 4 49 2 2 6 33 1 12 6 55 2 9 5...
Tuesday, January 28, 2014 at 8:56pm

bio statistics
using descriptive statistics for weight gain, a friend of yours had a baby and gained approximately 30 pounds during pregnancy. Explain to her why she should not be too depressed over this occurrence.
Tuesday, January 28, 2014 at 1:03pm

statistics
Using the descriptive statistics for the weight of the babies in ounces suppose a friend of yours has given birth to a 10 pound 3 ounce baby. Is this unusual? why or why not?
Tuesday, January 28, 2014 at 12:58pm

Statistics
The variance of the mathematical scores of a sample of 21 high school girls was found to be 100 and that of a sample of 25 high school boys was 169. Test the hypothesis that the scores of the high school boys are more varying that those of the high school girls at alpha = 0.05...
Monday, January 27, 2014 at 10:22am

Statistics
What I mean by a "running number" is that the average is always changing. If I turn in 10 homework assignments and the grades are as follows: 58, 87, 99, 90, 92, 95, 89, 90, 95, 91 then my average is 88.6. If I turn in 10 more assignments my average changes, we don&#...
Sunday, January 26, 2014 at 2:28pm

statistics
A psychologist studied self esteem scores and found the sample data set to be normally distributed with a mean of 50 and a standard deviation of 5?
Saturday, January 25, 2014 at 7:36pm

statistics
when will I know it is time to calculate the mean? Is the mean a running number?
Saturday, January 25, 2014 at 11:19am

Statistics
In an essay of 250-500 words, thoroughly address the following items and respond to the related questions: 1.Define the term standard deviation. Why is it important to know the standard deviation for a given sample? What do researchers learn about a normal distribution from ...
Thursday, January 23, 2014 at 4:00am

statistics
do we need to calculate z in order to use the critical value like we did when we calculated the p value?
Monday, January 20, 2014 at 3:30pm

statistics
4 Find: a. The z score for each male salary, based on only the male salaries. b. The z score for each female salary, based on only the female salaries. c. The z score for each female compa, based on only the female compa values. d. The z score for each male compa, based on ...
Sunday, January 19, 2014 at 11:24pm

statistics
What is the probability for a: a.       Randomly selected person being a male in grade E? b.      Randomly selected male being in grade E? c. Why are the results different?
Sunday, January 19, 2014 at 11:23pm

Statistics for Business
Consider the GPA’s for the following 15 students 3.10, 3.20, 3.49, 2.68, 3.73, 3.39, 3.80, 3.11, 3.10, 3.10, 4.0, 3.89, 2.55, 4.0, and 3.75 a) Compute the max, min, Q1, median 3.9, Q3, IQR, and range 1.45 b) Using the variables from part a), construct a box plot for GPA. ...
Sunday, January 19, 2014 at 8:25pm

Statistics for Business
Consider the following sample of data: 11.2, 28.4, 32.6, 17, 13.5, 2.2, 38, 41.4, 1.9, 14.4, 21.8, 23.8 a) Calculate the max, min, Q1, median, and Q3 b) Calculate the average c) Calculate the standard deviation d) Calculate the variance
Sunday, January 19, 2014 at 8:24pm

statistics
A lottery uses 4 urns containing chips 0 to 9. One chip is selected at random from each urn. How many sample points are in the sample space?
Saturday, January 18, 2014 at 11:24am

statistics
. Consider a football team for whom the numbers on the active players’ jerseys are 29, 41, 50, 58, 79, and 10, (listed in order of the players’ names). Does it make sense to calculate the means of those numbers? Why or why not?
Saturday, January 11, 2014 at 7:23pm

Statistics
Students are being surveyed about the weight of books and supplies they are carrying as they attend class. a. Identify the variable of interest b. Identify the type of variable c. List a few values that might occur in a sample
Saturday, January 11, 2014 at 4:52pm

Statistics
Blossom’s Flowers purchases roses for sale for Valentine’s Day. The roses are purchased for $10 a dozen and are sold for $20 a dozen. Any roses not sold on Valentine’s Day can be sold for $5 per dozen. The owner will purchase 1 of 3 amounts of roses for ...
Friday, January 10, 2014 at 9:55am

Statistics
Hi * Suppose X has the pdf f(x)=(1/2)e^-|x| if -∞<x<∞ a)find the pdf of Y=|X|^3 b) Let W=0 if x<=0 and W=1 if x>1. Find cdf (cum.dist.func) of W.
Friday, January 10, 2014 at 8:59am

Statistics
hii. I have a question about pdf and cdf.. I couldn't solve it Please help me :/ 1) the pdf of the random var. X is given by f(x)= (3/8)(x+1)^2 if -1<x<1 0 if otherwise Find the pdf of a) Y=1-X^2 b) Y=1-X^2 ifx<=0 and Y=1-X if x>0
Friday, January 10, 2014 at 8:57am

statistics
You are interested in the weights of backpacks students carry to class and decide to conduct a study using the backpacks carried by 30 students. (a) Give some instructions for weighing the backpacks. Include unit of measure, accuracy of measure, and type of scale.
Wednesday, January 8, 2014 at 9:23pm

statistics
For a particular population, a sample of n = 4 scores has an expected value of 10. For the same population, a sample of n = 25 scores would have an expected value of ____. a. 4 b. 8 c. 10 d. 20
Wednesday, January 8, 2014 at 7:34pm

statistics
A sample from a population with  = 40 and  = 10 has a mean of M = 44. If the sample mean corresponds to a z = 2.00, then how many scores are in the sample? a. n = 100 b. n = 25 c. n = 5 d. n = 4
Wednesday, January 8, 2014 at 7:33pm

statistics
True Or False Using the average score to describe a sample is an example of inferential statistics. By reading the definition in my book I feel as though this phrase is false. Can someone please advise on this matter?
Tuesday, January 7, 2014 at 10:49am

statistics
True or False If one score is randomly selected from a normal distribution with  = 100 and  = 20, the probability of obtaining a score between X = 80 and X = 120 is 0.3413.
Monday, January 6, 2014 at 2:00pm

statistics
True or False For any normal distribution, the proportion corresponding to scores greater than z = +1.00 is exactly equal to the proportion corresponding to scores less than z = 1.00.
Monday, January 6, 2014 at 1:57pm

Language Arts
Anybody out there from 7th grade connections academy??! need help checking my answers!!: 1. The author's tone in this editorial is (1 point) sad humorous compassionate angry 2. What is the key phrase used to signal a comparison or contrast in the following statement? "...
Saturday, January 4, 2014 at 6:46pm

Math
I need assistance with statistics and probability. Can you some how assist me with that.?
Friday, January 3, 2014 at 10:25pm

statistics
True or False For a sample with M = 20 and s = 1, a score of X = 17 would be considered an extremely low score.
Friday, January 3, 2014 at 8:33pm

statistics
True or False A sample mean with a z-score value between 1.00 and +1.00 would be considered a fairly typical, representative sample.
Friday, January 3, 2014 at 6:57pm

statistics
true or false The value for the standard deviation cannot be larger than the value for the range.
Friday, January 3, 2014 at 6:43pm

statistics
True or False The class interval of 25-29 has real limits of 24.5 and 29.5.
Wednesday, January 1, 2014 at 10:52pm

statistics
A random sample of n = 4 scores is selected from a population with ƒÝ = 80 and ƒã = 20. On average, how much difference would you expect between the sample mean and the population mean? a. 0 points (the sample mean should be the same as the population ...
Tuesday, December 31, 2013 at 8:51pm

statistics
Last week Tom had exams in Math and in Spanish. He had a score of 45 on the Math exam and a score of 65 on the Spanish exam. For which class should Tom expect the better grade? a. Math b. Spanish c. The grades should be the same because the two exam scores are in the same ...
Tuesday, December 31, 2013 at 8:07pm

statistics
The sum of the squared deviation scores is SS = 20 for a population of N = 5 scores. What is the variance for this population? a. 4 b. 5 c. 80 d. 100
Tuesday, December 31, 2013 at 7:57pm

statistics
Needing help to get this answer right. _c___ 3. What is the relationship between the alpha level, the size of the critical region, and the risk of a Type I error? a. As the alpha level increases, the size of the critical region increases and the risk of a Type I error ...
Sunday, December 29, 2013 at 11:01am

statistics
Needing some help to clarify this problem and help finding the right answer. _b___ 2. Which of the following accurately describes the critical region? a. outcomes with a very low probability if the null hypothesis is true b. outcomes with a high probability if the null ...
Sunday, December 29, 2013 at 10:58am

statistics
I really need help with my statistical analysis... i cant understand it. Here are the questions A sample group was surveyed to determine which of two brands of soap was preferred. H0 :p = 0.50; H1: p is not equal to 0.50. Thirty-eight of 60 people indicated a preference. At ...
Friday, December 27, 2013 at 2:22pm

statistics
A sample of n = 25 scores has M = 20 and s2 = 9. What is the sample standard deviation? a. 3 b. 4.5 c. 9 d. 81
Thursday, December 26, 2013 at 7:00pm

statistics
In a population of N = 10 scores, the smallest score is X = 8 and the largest score is X = 20. Using the concept of real limits, what is the range for this population? a. 11 b. 12 c. 13 d. cannot be determined without more information
Thursday, December 26, 2013 at 6:59pm

Statistics
A researcher measures eye color for a sample of n = 50 people. Which measure of central tendency would be appropriate to summarize the measurements? a. mean b. median c. mode d. any of the three measures could be used
Wednesday, December 25, 2013 at 7:25pm

Statistics
For a negatively skewed distribution with a mode of X = 25 and a median of 20, the mean is probably ____. a. greater than 25 b. less than 20 c. between 20 and 25 d. cannot be determined from the information given
Monday, December 23, 2013 at 8:20pm

Statistics
One item on a questionnaire asks, "How many siblings (brothers and sisters) did you have when you were a child?" A researcher computes the mean, the median, and the mode for a set of n = 50 responses to this question. Which of the following statements accurately ...
Monday, December 23, 2013 at 8:19pm

Statistics
The National Highway Traffic Safety Administration analyzes the crash test data for new cars. One variable measured is the severity of the injury due to a collision. The higher the severity, the higher the points assigned. Assume that the injury rating is normally distributed ...
Sunday, December 22, 2013 at 12:44pm

Statistics
Can someone please help with this problem to advise how to set up and in the book Essential of Statistics for the Behavioral Sciences. A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n=25 third-...
Friday, December 20, 2013 at 10:36pm

Statistics
If the alpha level is changed from a=.05 to a=.01. a. What happens to the boundaries for the critical region? b. What happens to the probability of a Type I error?
Friday, December 20, 2013 at 10:19pm

Statistics
True or False In most research situations, the goal of a hypothesis test is to reject the null hypothesis.
Friday, December 20, 2013 at 9:24pm

Statistics
True or False The null hypothesis is stated in terms of the population, even though the data come from a sample.
Friday, December 20, 2013 at 9:15pm

Statistics
3. The formula for finding sample standard deviation is ________________. a.𝑠=∑1▒𝑥W​22;𝑥 ̅^2 b.𝜎^2=(∑1▒(𝑋​−𝜇)^2 )/𝑁 c.𝑠^2=(∑1▒(𝑋​&#...
Friday, December 20, 2013 at 7:14pm

statistics
A student union wants to obtain a 90% confidence interval for the proportion of “full time” students who hold a part-time job for 20 hours or more per week. For this purpose, they want to interview a sample of full-time students. They want a margin of error to be at ...
Friday, December 20, 2013 at 12:33pm

Statistics
By definition, a Type I error is ____. a. rejecting a false H1 b. rejecting a false H0 c. rejecting a true H0 d. rejecting a true H1
Friday, December 20, 2013 at 8:35am

Statistics
Which of the following is an accurate definition of a Type II error? a. rejecting a false null hypothesis b. rejecting a true null hypothesis c. failing to reject a false null hypothesis d. failing to reject a true null hypothesis
Friday, December 20, 2013 at 8:33am

Statistics
What is the consequence of a Type II error? a. concluding that a treatment has an effect when it really does b. concluding that a treatment has no effect when it really has no effect c. concluding that a treatment has no effect when it really does d. concluding that a ...
Friday, December 20, 2013 at 8:32am

MATH Statistics
A student union wants to obtain a 90% confidence interval for the proportion of “full time” students who hold a part-time job for 20 hours or more per week. For this purpose, they want to interview a sample of full-time students. They want a margin of error to be at ...
Friday, December 20, 2013 at 1:07am

statistics
For these 90 times the mean was 15.60 minutes and the standard deviation s=1.80 minutes. Find the margin of error (round to 2 decimal places) and the 95% confidence interval for Julia’s average running time.
Thursday, December 19, 2013 at 8:54pm

Statistics
When is there a risk of a Type II error? a. whenever H0 is rejected b. whenever H1 is rejected c. whenever the decision is "fail to reject H0" d. The risk of a Type II error is independent of the decision from a hypothesis test.
Thursday, December 19, 2013 at 4:01pm

Statistics
Which of the following will increase the power of a statistical test? a. Change Ą from .05 to .01. b. Change from a one-tailed test to a two-tailed test. c. Change the sample size from n = 100 to n = 25. d. None of the other options will increase power.
Thursday, December 19, 2013 at 4:01pm

statistics
Solve the problem. Round to the nearest tenth unless indicated otherwise. The amount of rainfall in January in a certain city is normally distributed with a mean of 4.3 inches and a standard deviation of 0.3 inches. Find the value of the quartile .
Wednesday, December 18, 2013 at 5:44pm

probability & statistics
Find the slope and the y-intercept for the line that passes through (-9,5) (11,12)
Wednesday, December 18, 2013 at 4:33pm

Statistics
A national opinion poll found that 44% of all American adults agree that parents should be given vouchers good for education at any public or private school of their choice. Suppose that in fact the population proportion who feel this way is p=0.44. A) Many opinion polls have ...
Tuesday, December 17, 2013 at 7:24pm

statistics 3.
A student union wants to obtain a 90% confidence interval for the proportion of “full time” students who hold a part-time job for 20 hours or more per week. For this purpose, they want to interview a sample of full-time students. They want a margin of error to be at ...
Tuesday, December 17, 2013 at 5:23pm

statistics 4.
The manufacturer of Porshe 918 Spyder car claims that their car can go from 0 mph to 60 mph speed in less than 2.5 seconds. To test this claim, a sample of 40 new cars of this type were driven and their average 0-60 mph time was 2.6 seconds with a standard deviation of 0.5 ...
Tuesday, December 17, 2013 at 5:23pm

statistics 3.
A student union wants to obtain a 90% confidence interval for the proportion of “full time” students who hold a part-time job for 20 hours or more per week. For this purpose, they want to interview a sample of full-time students. They want a margin of error to be at ...
Tuesday, December 17, 2013 at 2:20pm

statistics 4.
The manufacturer of Porshe 918 Spyder car claims that their car can go from 0 mph to 60 mph speed in less than 2.5 seconds. To test this claim, a sample of 40 new cars of this type were driven and their average 0-60 mph time was 2.6 seconds with a standard deviation of 0.5 ...
Tuesday, December 17, 2013 at 2:19pm

statistics
Use a 1.15 level of significance to test a claim that a true proportion is less than 47% when n=250 and x-112
Monday, December 16, 2013 at 11:07pm

statistics-PLEASE HELP quick
A family has four children and we assume that births occur with equal frequency for both sexes. Construct a sample space for all possible family arrangements allowing for order of birth to count. a) How many different arrangements are possible? b)find P (three are boys)= c)...
Monday, December 16, 2013 at 11:05pm

statistics
4. Are women getting taller? In one state, the average height of a woman aged 20 years or older is 63.7 inches in 1990. A random sample of 100 women is taken to test if women’s mean height today is different from 1990. The mean height of the 100 surveyed women is 63.9 ...
Monday, December 16, 2013 at 10:13pm

Statistics 4
The manufacturer of Porshe 918 Spyder car claims that their car can go from 0 mph to 60 mph speed in less than 2.5 seconds. To test this claim, a sample of 40 new cars of this type were driven and their average 0-60 mph time was 2.6 seconds with a standard deviation of 0.5 ...
Monday, December 16, 2013 at 9:42pm

statistics
The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 135 and a variance of 16. The material is considered defective if the breaking strength is less than 126.2 pounds. What is the probability that a single, randomly selected ...
Monday, December 16, 2013 at 9:39pm

Statistics 3
A student union wants to obtain a 90% confidence interval for the proportion of “full time” students who hold a part-time job for 20 hours or more per week. For this purpose, they want to interview a sample of full-time students. They want a margin of error to be at ...
Monday, December 16, 2013 at 9:38pm

statistics
I have done an entire project based on football scores from a certain team over the last 3 years and I'm not sure what information I can get from my answers. Ive done a frequency distribution table, Ogive, Histogram,cumulative frequency table, frequency polygon, etc. and I...
Monday, December 16, 2013 at 7:54pm

statistics-PLEASE HELP quick
I understand most of the formulas however Im not sure what the answers tell me. I did a frequency distribution table for all points scored by a football team over 4 years, but I don't understand what my answers mean and I don't want to look stupid in front of my class...
Monday, December 16, 2013 at 7:47pm

statistics in psychology
12. Four research participants take a test of manual dexterity (high scores mean better dexterity) and an anxiety test (high scores mean more anxiety). The scores are as follows. Person Dexterity Anxiety 1 1 10 2 1 8 3 2 4 4 4 –2 (a) Scatter Graph: Scatter and Regression
Monday, December 16, 2013 at 3:40pm

Statistics 2
The body temperature of healthy human beings can be assumed to have a normal distribution with mean  and standard deviation . Body temperature measurements taken from a sample of 130 healthy individuals shows the sample mean temperature to be 98.249O F and ...
Monday, December 16, 2013 at 1:21pm

Statistics
A manufacturing facility produces iron rods whose mean diameter is 2.5 inches with a standard deviation of 0.2 inch. If a sample of 50 metal rods produced by the facility were randomly selected, what is the probability that the mean of these rods will lie between 2.4 inches ...
Monday, December 16, 2013 at 12:53pm

Statistics
True or False: For ANOVA you will reject the null hypothesis is the variability within a sample is greater than the variability among samples?
Sunday, December 15, 2013 at 6:02pm

statistics
3. Assuming α = 0.05 and that the population is normally distributed, is there enough evidence to support a claim that the mean amount of servings teenage females drink is less than or equal to 1.5 servings per day?
Saturday, December 14, 2013 at 7:57pm

Statistics
In a game you roll two fair dice. If the sum of the two numbers obtained is 3,4,9,10 or 11 you win $20. If the sum is 5,6,7 or 8 you pay $20. However if the scores on the dice are the same no one is required to pay. (a) Construct a probability distribution table for the event...
Saturday, December 14, 2013 at 4:30pm

statistics
9. Explain the transformation needed to convert the following data to a linear data set. {(1, 0.98), (2, 1.39), (3, 1.71), (4, 1.98), (5, 2.22), (6, 2.43)} (6 points)
Friday, December 13, 2013 at 7:15pm

Statistics
For a population with a mean of µ=60 and standard deviation of Ợ=24, find the z=score corresponding to each of the following samples a. M=63 for sample of n=16 scores b. M=63 for sample of n=36 scores c. M=63 for sample of n=64 scores
Friday, December 13, 2013 at 7:12pm

statistics
what is the variance of 18, 16, 12, 2, 11
Friday, December 13, 2013 at 6:12pm

Statistics
Scores on a certain exam are normally distributed with a mean of 78 and a variance of 25. What is the score obtained by the top 5% of the students? I do not understand the 5% part. What does the tail look like on the bell-shaped graph?
Friday, December 13, 2013 at 4:03am

Statistics
True or False The mean for a sample of n = 4 scores has a standard error of 5 points. This sample was selected from a population with a standard deviation of ċ = 20.
Thursday, December 12, 2013 at 10:19pm

Statistics
True or False As sample size increases, the value of the standard error also increases.
Thursday, December 12, 2013 at 10:18pm

mah statistics
the following table gives the number of camcorders sold on a given day in an electronics store X: 0, 1, 2, 3, 4, 5, 5, P(x) 0.5, .12, .23, .3, .16, .1, .04 find the mean, variance, and standard deviation of the daily sales of camcorders in the store.
Thursday, December 12, 2013 at 6:52pm

Statistics
How is the rejection region defined and how is that related to the z-score and the p value? When do you reject or fail to reject the null hypothesis? Why do you think statisticians are asked to complete hypothesis testing? Can you think of examples in courts, in medicine, or ...
Thursday, December 12, 2013 at 12:16am

Statistics
Can someone help me do this problem? A group of environmentalist are trying to estimate the population of the state rid in clear view park. They capture a sample of 500 birds in early spring and tag them. in august they capture 215 birds, of which 20 are tagged. a) use the ...
Thursday, December 12, 2013 at 12:12am

Statistics
True or False According to the central limit theorem, the expected value for a sample mean becomes smaller, approaching zero, as the sample size approaches infinity.
Wednesday, December 11, 2013 at 9:39pm

Statistics
True or False In order for the distribution of sample means to be normal, it must be based on samples of at least n = 30 scores.
Wednesday, December 11, 2013 at 9:39pm

Statistics
Multiple choice question that's hard to figure out and understand.(information provided) Ten members of a fraternity take a statistics course. Here are their scores on the first exam in the course: 61,74,47,60,62,63,65,79,55,85. The question states: In all, 135 students ...
Tuesday, December 10, 2013 at 11:52am

statistics
Ten members of a fraternity take a statistics course. Here are their scores on the first exam in the course. 61,74,47,60,62,63,65,79,55,85. In all 135 students took the exam. The third quartile for all 135 scores was 69. How many students had scores higher than 69?
Monday, December 9, 2013 at 9:17pm

STATISTICS
Program evaluation differs from policy analysis with respect to _____. a. the time dimension within the policy process b. the cost c. the time d. the role of the stakeholder
Monday, December 9, 2013 at 9:00pm

Statistics
True or False If a sample of at least 30 scores is randomly selected from a normal population, the sample mean will be equal to the population mean.
Monday, December 9, 2013 at 7:48pm

Statistics
A sample of n = 9 scores is obtained from a population with ƒÝ = 70 and ƒã = 18. If the sample mean is M = 76, then what is the z-score for the sample mean? a. z = 0.33 b. z = 0.50 c. z = 1.00 d. z = 3.00
Monday, December 9, 2013 at 7:32pm

STATISTICS HELP
A student wishes to test the accuracy of the measuring jug she is using in an experiment. The label on the jug claims that it measures volume to an accuracy of plus or minus 5 cm3. The density of water is about 0.999 g cm−3, which means that 100 cm3 of water should have ...
Monday, December 9, 2013 at 8:17am

Statistics
Suppose that you visit Shire, and find that 28% of Hobbits believe in the existence of Elves, 16% believe in the existence of Ents, and 9% believe in the existence of both Elves and Ents. You come across a Hobbit: i) What is the probability that he will believe in Ents given ...
Sunday, December 8, 2013 at 10:54pm

Psychological Statistics
Post a behavioral research situation that could use a Pearson coefficient research study and a chi square research study. Present the rationale for each selection. Be very specific in your presentation.
Sunday, December 8, 2013 at 4:33pm

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