# Homework Help: Math: Statistics

## Recent Homework Questions About Statistics

**statistics 3**

An airline promotion to business travelers is based on the assumption that no more than two-thirds of business travelers use a laptop computer on overnight business trips. 1. What is the sample proportion from an American Express-sponsored survey that found 365 of 543 business...

*Tuesday, September 23, 2014 by MIA*

**statistics 2**

In Hamilton County, Ohio the mean number of days needed to sell a home is 86 days (Cincinnati Multiple Listing Service, April, 2012). Data for the sale of 40 homes in a nearby county showed a sample mean of 80 days with a sample standard deviation of 20 days. Conduct a ...

*Tuesday, September 23, 2014 by MIA*

**statistics 1**

A study found that, in 2005, 12.5% of U.S. workers belonged to unions (The Wall Street Journal, January 21, 2006). Suppose a sample of 400 U.S. workers is collected in 2006 to determine whether union efforts to organize have increased union membership. Formulate the hypotheses...

*Tuesday, September 23, 2014 by MIA*

**math statistics**

A group of teenager smoking rate dropped 8.5% in 2007 from 17.6% in 2001 and 23% in 1997. 1. Calculate the probability that at least one in a group of 10 teenagers smoked in 2007.2. Calculate the probability that at least one in a group of 10 teenagers smoked in 2001. 1. ...

*Tuesday, September 23, 2014 by rachel*

**statistics 7**

Home values tend to increase over time under normal conditions, but the recession of 2008 and 2009 has reportedly caused the sales price of existing homes to fall nationwide (BusinessWeek, March 9, 2009). You would like to see if the data support this conclusion. The file ...

*Tuesday, September 23, 2014 by ANAHI*

**statistics 3**

An airline promotion to business travelers is based on the assumption that no more than two-thirds of business travelers use a laptop computer on overnight business trips. 1. What is the sample proportion from an American Express-sponsored survey that found 365 of 543 business...

*Tuesday, September 23, 2014 by ANAHI*

**statistics 2**

In Hamilton County, Ohio the mean number of days needed to sell a home is 86 days (Cincinnati Multiple Listing Service, April, 2012). Data for the sale of 40 homes in a nearby county showed a sample mean of 80 days with a sample standard deviation of 20 days. Conduct a ...

*Tuesday, September 23, 2014 by ANAHI*

**statistics 1**

A study found that, in 2005, 12.5% of U.S. workers belonged to unions (The Wall Street Journal, January 21, 2006). Suppose a sample of 400 U.S. workers is collected in 2006 to determine whether union efforts to organize have increased union membership. Formulate the hypotheses...

*Tuesday, September 23, 2014 by ANAHI*

**statistics**

Teenage smoking rate dropped to 8.5% in 2007 from 17.6% in 2001 and 23% in 1997. 1. Calculate the probability that at least one in a group of 10 teenagers smoked in 2007. 2. Calculate the probability that at least one in a group of 10 teenagers smoked in 2001. 3. Calculate the...

*Tuesday, September 23, 2014 by rachel*

**Statistics**

The following data set is the GPAs of the students in a statistics class. 1.93, 1.99, 2.00, 2.04, 2.12, 2.34, 2.55, 2.55, 2.75, 2.75, 2.80, 2.80, 2.85, 3.02, 3.12, 3.22, 3.31, 3.33, 3.45, 3.69 What percentile is a GPA of 2.34? A. About the 6th B. About the 15th C. About the ...

*Tuesday, September 23, 2014 by Amy*

**statistics**

The mean grade in this class last semester was 78.3, and the variance was 34.6 . The distribution of grades was unimodal and symmetrical.. determine how many students are likely to fail the class (<60), and how many students are likely to get a “A” (>90), if 60 ...

*Tuesday, September 23, 2014 by Nicole.H*

**statistics**

In order to study whether IQ level is related to birth order, data were collected from a sample of 540 students on their birth order (Oldest/In Between/Youngest) and their score on an IQ test. The data collected in this study would be best displayed using: what type of graph ...

*Tuesday, September 23, 2014 by sifuentes*

**Statistics**

The Graduate Record Examination (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. For each of the following problems: 1. Draw a rough sketch, darkening the ...

*Monday, September 22, 2014 by Jill*

**statistics**

3. Fill in the blanks with the appropriate raw scores, z-scores, T-scores, and percentile ranks. Note: the Mean = 50, SD = 5. Raw z T %ile 35 1.2 35 16

*Sunday, September 21, 2014 by Maame*

**statistics**

The Graduate Record Exam (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. What percentage score above 1300? What percentage score above 800? What percentage ...

*Sunday, September 21, 2014 by Jeremy*

**Math**

The college president asks the statistics teacher to estimate the average age of the students at their college. How large a sample is necessary? The statistics teacher decides the estimate should be accurate within half year and be 92% confident. From a previous study, the ...

*Sunday, September 21, 2014 by Don*

**statistics**

A sample of 100 patients who use the drug are followed over time. Those that use the drug have a mean life expectancy of 71.30 years. The mean life expectancy for the general population is 75.62 years. The population standard deviation is 28.

*Saturday, September 20, 2014 by Michelle*

**statistics**

Suppose that the scores on a reading ability test are normally distributed with a mean of and a standard deviation of . What proportion of individuals score more than points on this test

*Saturday, September 20, 2014 by rita*

**statistics**

a study was conducted of all 1849 students in a certain country.whether the value is parameter or statistics

*Saturday, September 20, 2014 by rahul*

**econ 2110**

Suppose that we want to test whether the mean selling price of houses with is the same as the mean selling price of houses without a garage. We collect two samples and obtain the following information: Houses with garage Sample size: 71 Mean selling price (in thousands of ...

*Friday, September 19, 2014 by katlyn*

**statistics**

Calculate the approximate probability that the average time (taken over the 100 days) she spends waiting for a bus each day is more than 16 minutes

*Friday, September 19, 2014 by Anonymous*

**statistics**

The time a student spends in the shower on any school day is an exponential random variable with a mean of 298 seconds. a)What is the probability that the student spends more than 310 seconds in the shower on one day? b) What is the probability that the student spends an ...

*Thursday, September 18, 2014 by Pr*

**statistics**

the wieights of newborn babies are distributed normally, with the mean of approximately 115 oz and a standard deviation of 20 oz. if a newborn baby is selected at random. what is the probability that the baby weighs more than 95 oz?

*Thursday, September 18, 2014 by michelle*

**statistics**

the weights of newborn babies are distributed normally, with the mean of approximately 115 oz and a standard deviation of 20 oz. if a newborn baby is selected at random. what is the probability that the baby weighs more than 95 oz?

*Thursday, September 18, 2014 by michelle*

**stats**

The following data represents Total Credit Hours from our class survey. 90 54 98 45 65 43 12 48 56 12 15 60 38 18 67 125 50 43 26 64 22 52 69 You may use your calculator to find the following statistics: Considering the Total Credit Hours data from our class survey: (A1) What ...

*Thursday, September 18, 2014 by Angel*

**Statistics**

Jim's systolic blood pressure is a random variable with a mean of 145 mmHg and a standard deviation of 20 mmHg. For Jim's age group, 140 is the cutoff for high blood pressure. If Jim's systolic blood pressure is taken at a randomly chosen moment, what is the probability that ...

*Wednesday, September 17, 2014 by Loray*

**stats**

i need help with this Question The following data represents Total Credit Hours from our class survey. 90 54 98 45 65 43 12 48 56 12 15 60 38 18 67 125 50 43 26 64 22 52 69 You may use your calculator to find the following statistics: Mean __________ Median _______ Mode (if it...

*Wednesday, September 17, 2014 by JOJO*

**STATS**

i need help with this Question The following data represents Total Credit Hours from our class survey. 90 54 98 45 65 43 12 48 56 12 15 60 38 18 67 125 50 43 26 64 22 52 69 You may use your calculator to find the following statistics: Mean __________ Median _______ Mode (if it...

*Wednesday, September 17, 2014 by JOJO*

**statistics**

The data represents the daily rainfall (in inches) for one month. Construct a frequency distribution beginning with a lower class limit of 0.00 and use a class width of 0.20. The frequency of the first class limit (0.00 – 0.19) is: 0.44 0 0 0.24 0 0.65 0 0.21 0 0 1.25 0 0.18...

*Wednesday, September 17, 2014 by niela*

**statistics**

The researcher in exercise 2 decides to conduct the same study using a within- participants design to control for differences in cognitive ability. He selects a random sample of subjects and has them study different material of equal difficulty in both the music and no music ...

*Tuesday, September 16, 2014 by adrienne*

**statistics**

A standardized test has a mean of 88 and a standard deviation of 12. What is the score at the 90th percentile? Assume a normal distribution. how would I solve? a. 90.00 b. 112.00 c. 103.36 d. 91.00

*Tuesday, September 16, 2014 by Nicole*

**Check This Statistics Homework**

1.) Based on a survey of a few thousand people, a newspaper reporter wants to draw conclusions about how a country’s citizens in general feel about the war in Iraq. At this point, is the reporter mainly concerned with data production, displaying and summarizing data, ...

*Tuesday, September 16, 2014 by Beck J*

**Statistics**

Hi! I had this one last question on my homework that I wasn't sure about, but, I need someone to check this for me and see if this is right. Thanks so much! Question: The study that looked at prevalence of various appliance in homes in 2001 made a comparison to the percentages...

*Tuesday, September 16, 2014 by Beck J*

**Business statistics**

A new drug that treats patients with anxiety has a 60% success rate in improving the patient’s condition. For a random sample of eight patients taking this drug, determine the probability that: 4.2.1. four patients have improvement in their condition. 4.2.2. at least two ...

*Tuesday, September 16, 2014 by Nthabiseng*

**statistics**

5. A soft drink dispensing machine uses paper cups that hold a maximum of 12 ounces. The machine is set to dispense a mean of 10 ounces of the drink. The amount that is actually dispensed varies. It is normally distributed with a standard deviation of one ounce. (a) What ...

*Monday, September 15, 2014 by Sarah*

**Statistics**

Are my answers correct? Thanks! 1.) Based on a survey of a few thousand people, a newspaper reporter wants to draw conclusions about how a country’s citizens in general feel about the war in Iraq. At this point, is the reporter mainly concerned with data production, ...

*Monday, September 15, 2014 by Andrew*

**Statistics Homework Check**

Hi! I had this one last question on my homework that I wasn't sure about, but, I need someone to check this for me and see if this is right. Thanks so much! Question: The study that looked at prevalence of various appliance in homes in 2001 made a comparison to the percentages...

*Monday, September 15, 2014 by Becky*

**statistics**

Air travel is probably not as fun as it used to be. Airlines have increased fares, reduced seat size, and now charge fees for everything from luggage to early boarding. Airlines can be fined by the federal transportation agencies for various "infractions". One issue subject to...

*Monday, September 15, 2014 by Lupe*

**Statistics**

Are my answers correct? Thanks! 1.) Based on a survey of a few thousand people, a newspaper reporter wants to draw conclusions about how a country’s citizens in general feel about the war in Iraq. At this point, is the reporter mainly concerned with data production, ...

*Monday, September 15, 2014 by Andrew*

**Statistics Homework Check**

Hi! I had this one last question on my homework that I wasn't sure about, but, I need someone to check this for me and see if this is right. Thanks so much! Question: The study that looked at prevalence of various appliance in homes in 2001 made a comparison to the percentages...

*Monday, September 15, 2014 by Becky*

**Statistics**

A class consists of 9 students with an average age of 40. When the Instructor arrives the average age of the students and the Instructor is 41. What is the age of the Instructor?

*Monday, September 15, 2014 by mike*

**statistics**

4.2. A new drug that treats patients with anxiety has a 60% success rate in improving the patient’s condition. For a random sample of eight patients taking this drug, determine the probability that: 4.2.1. Four patients have improvement in their condition 4.2.2. At least two...

*Monday, September 15, 2014 by shahistha*

**statistics**

Calculate the Pearson’s correlation coefficient Assessed value (R’000) Selling price (R’000) 116 185 160 246 144 236 103 162 205 300

*Monday, September 15, 2014 by shahistha*

**statistics**

Calculate the probability of withdrawing 13 balls of yellow color in 16 draws from a bag of 93 balls having 38 red, 34 yellow and 21 pink balls.

*Monday, September 15, 2014 by rts*

**statistics**

A random sample of 8 male college students was taken and asked to report their shoe size and height in inches

*Sunday, September 14, 2014 by Shabaka*

**statistics**

Air travel is probably not as fun as it used to be. Airlines have increased fares, reduced seat size, and now charge fees for everything from luggage to early boarding. Airlines can be fined by the federal transportation agencies for various "infractions". One issue subject to...

*Sunday, September 14, 2014 by Lupe*

**Statistics**

If you have a curve with an asymmetric bimodal distribution, is it considered a normal distribution? Or is it only a normal distribution if there is a single bell-shaped curve?

*Sunday, September 14, 2014 by CiCi*

**statistics**

AAA reports that the average age of a car on U.S. roads in recent years has risen to 7.5 years. Suppose that the distribution of the age of automobiles assumes a mound shaped distribution. If 99.7% of the ages are between 1 year and 14 years, what is the value of the standard ...

*Sunday, September 14, 2014 by Anonymous*

**Elementry Statistics**

The census figures show that the average income for a family in a rural region is approximately $34,860 per year. A random sample has a mean income of $33,566 per year, with a standard deviation of $1,245. At a sig. level of .0.01 is there enough evidence to reject the claim?

*Sunday, September 14, 2014 by Dre*

**statistics**

You have just completed a round trip to New York and back by car. The one way distance traveled is 210 miles. If your average speed traveling to New York was 70 miles per hour and your average speed returning to Baltimore was 50 miles per hour (heavy traffic) what was your ...

*Sunday, September 14, 2014 by Anonymous*

**Statistics**

12 cards are drawn with replacement from an ordinary deck of 52 cards. What is the probability that 4 queens of hearts, 4 aces of spades, and 4 kings of clubs are drawn?

*Sunday, September 14, 2014 by Connor*

**statistics**

You have just completed a round trip to New York and back by car. The one way distance traveled is 210 miles. If your average speed traveling to New York was 70 miles per hour and your average speed returning to Baltimore was 50 miles per hour (heavy traffic) what was your ...

*Sunday, September 14, 2014 by Anonymous*

**Statistics**

Each day a local radio station randomly draws a date (without replacement) from a bowl containing all the days in the year. The first person who calls in with their birthday on the date drawn gets a prize. what is the probability that none of the birthdays selected in the ...

*Sunday, September 14, 2014 by George*

**Statistics**

If P(A/B)=1 must A=B?

*Sunday, September 14, 2014 by Connor*

**statistics; emergency please help me**

Air travel is probably not as fun as it used to be. Airlines have increased fares, reduced seat size, and now charge fees for everything from luggage to early boarding. Airlines can be fined by the federal transportation agencies for various "infractions". One issue subject to...

*Saturday, September 13, 2014 by Anahi*

**statistics**

A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 13 hours, with a standard deviation of 2.5 hours. It is desired to estimate the mean viewing time within two-quarter ...

*Saturday, September 13, 2014 by Anonymous*

**Statistics**

The following are weights (in lbs) for a sample of 11 baby boys at the age of 18 months: 21.8 22.2 23.4 24.6 25.1 26.7 27.3 28.0 29.8 30.9 31.2 What is the 80th percentile estimate for these sample?

*Friday, September 12, 2014 by Aurora*

**Statistics – Lab Week 2**

11. Using the empirical rule, 68% of male heights should be between what two values? Either show work or explain how your answer was calculated.

*Friday, September 12, 2014 by Jean*

**Statistics**

In a survey of 80 high school football players who committed to play in the Division III CCIW conference, 64 said that they would work out in their high school weight rooms in the summer before college. The margin of error for the survey was 6%. A census of all CCIW football ...

*Friday, September 12, 2014 by Amy*

**Statistics**

1. A poll of 700 persons attending the Taste of Chicago showed that 455 persons, 65% of the sample, believed that the food was overpriced. It is estimated that 1,250,000 persons attend the Taste. Statistics suggest that, although 65% plus or minus 5% of attendees believe that ...

*Friday, September 12, 2014 by Amy*

**statistics**

What is the mathematical relationship between the confidence level and the level of significance, α? Can you explain this to me in an easy to understand way? Thank you

*Thursday, September 11, 2014 by MissPatte*

**statistics**

Let E and F be two events for which the probability of atleast one of them occurs is 3/4. what is the probability that neither E nor F will occur.

*Thursday, September 11, 2014 by jasmine*

**Statistics**

One month before a recall election, a poll of 500 Wisconsin voters showed that 46% planned to vote for the Democratic challenger Tom Barrett and 45% planned to vote for Republican Governor Scott Walker. Undecided voters constituted another 9%. The margin of error was 5 ...

*Thursday, September 11, 2014 by Amy*

**Statistics**

A nutritionist wants to conduct a study to validate the efficacy of an herb as an aid in weight loss. She randomly assigns half of a group of overweight persons to a treatment group who are given the herb with instructions for its use and a planned diet for six weeks. The ...

*Thursday, September 11, 2014 by Amy*

**Statistics**

The father of a junior high school student wants to determine the most popular book among junior high students. Select the sample with the least potential bias. A. A randomly selected group of 10 book sellers B. A randomly selected group of 30 junior high students C. A ...

*Thursday, September 11, 2014 by Amy*

**Statistics**

A poll was taken of a random sample of 1189 college students. Of these students, 789 reported that they had a drinking binge (more than 10 drinks in an evening) in the past month. Select the most believable conclusion. A. About 66.358% of college students indulged in binge ...

*Thursday, September 11, 2014 by Amy*

**statistics**

In this question, use Excel functions rather than Normal distribution tables. The number of new cars sold by "Ma's New Car Factory" in a financial year can be approximated by a normal distribution with a mean of 125,000 cars and a standard deviation of 34,000 cars. Part A In ...

*Thursday, September 11, 2014 by Sylvia*

**statistics**

A researcher hypothesizes that individuals who listen to classical music will score differently from the general population on a test of spatial ability. On a standardized test of spatial ability, (u = 58). A random sample of 14 individuals who listen to classical music is ...

*Thursday, September 11, 2014 by adrienne*

**statistics**

Henry performed a two- tailed test for an experiment in which N = 24. He could not find his table of t critical values, but he remembered the tcv at df = 13. He decided to compare his tobt with this tcv. Is he more likely to make a Type I or a Type II error in this situation?

*Thursday, September 11, 2014 by adrienne*

**statistics**

Let E and F be two events for which the probability of atleast one of them occurs is 3/4. what is the probability that neither E nor F occurs? The hint is to use Demorgan's laws

*Wednesday, September 10, 2014 by rebecca*

**statistics**

each of 10 men questioned 100 individuals whether X is a singer. If the answer yes has the probability 0.5. what is the number of individuals who answers assertively?

*Wednesday, September 10, 2014 by saibal*

**statistics**

Given a normally distributed population of values with a mean of 76 and a standard deviation of 10 what is the probability that a value is 71 and 82

*Tuesday, September 9, 2014 by bono*

**math**

how do i calculate for class midpoint under statistics?

*Tuesday, September 9, 2014 by Anonymous*

**statistics**

The average one-way commute time for a random sample of 256 area residents of a city is 90 minutes, with a standard deviation of 24 minutes. Construct a 90% confidence interval for the mean commute time of all residents. Construct a 98% confidence interval for the mean commute...

*Monday, September 8, 2014 by tee jay*

**statistics**

It is time to go shopping for new clothes for school! You have found a catalog for new clothes. You decide that you will buy ve dierent shirts, four dierent pants, two dierent jackets, and three dierent shorts. The catalog has twelve dierent types of shirts, ten dierent ...

*Monday, September 8, 2014 by Linda*

**statistics**

Is 28.065 more or less than 28.506

*Monday, September 8, 2014 by Anonymous*

**statistics**

At a local college, 81 of the male students are smokers and 729 are non-smokers. Of the female students, 350 are smokers and 350 are non-smokers. A male student and a female student from the college are randomly selected for a survey. What is the probability that both are ...

*Monday, September 8, 2014 by Tracey*

**Statistics**

Let's pretend the Work variable is normally distributed, with a mean/median/mode value of 22 and a standard deviation of 17. Based on these numbers, we can say that approximately 50 percent of SOC 390 students work more than ____ hours per week (round answer to the nearest ...

*Monday, September 8, 2014 by Chris*

**Statistics**

Let's pretend the Work variable is normally distributed, with a mean/median/mode value of 22 and a standard deviation of 17. Based on these numbers, we can say that approximately 68 percent of SOC 390 students work between ______ and ______ hours per week.

*Monday, September 8, 2014 by Chris*

**statistics**

there are 450 employee in an organization. using the method of random sampling numbers, select a sample of 20 employees

*Monday, September 8, 2014 by Anonymous*

**statistics**

A study was conducted in which the teachers were asked to rate students for a particular trait on a ten point scale. With the help of data given below find out whether significant difference exists in the rating of the students by the teachers. Teachers Students A B C D E F G ...

*Monday, September 8, 2014 by shimali*

**statistics**

A statistical analysis firm is hired to analyze the failure rate of a manufactured product. Which margin of error below would best indicate that the data used by the firm is a valid representation of the population? I don't understand the question they're asking me. The ...

*Sunday, September 7, 2014 by olivia*

**statistics**

Determine the probability that the single card drawn from a standard 52-card deck is a four, a five, or a spade. Illustrate the probabilities using a Venn Diagram

*Saturday, September 6, 2014 by thankyou*

**statistics**

At a school consists of 62% undergraduate, 55% of the students are males, and 48% of the undergraduate students are male. a. Determine the probability that a randomly selected student is either male or an undergraduate b. Illustrate the probabilities using a Venn Diagram

*Saturday, September 6, 2014 by thankyou*

**statistics**

Define the concept of independent events with regards to probability. Provide an example of an event that is independent and an event that is not independent

*Saturday, September 6, 2014 by thankyou*

**statistics**

A survey was conducted at a school to determine how many students use the outside recreational areas for studying versus recreational. Out of 43 students at the park 25 students were not studying. What is the probability that you would come across a student studying at the park?

*Saturday, September 6, 2014 by thankyou*

**statistics**

Define each of the following probability terms for the scenario of determining the probability that when a couple has 3 children, they will have exactly 2 boys. Assume that boys and girls are equally likely and that the gender of any child is not influenced by the gender of ...

*Saturday, September 6, 2014 by thankyou*

**Statistics**

Event A occurs with probability 0.1 and event B with probability 0.5 A) What is the maximum probability that the intersection of A and B can have? B) What is the minimum probability that the intersection of A and B can have? C) If it is know that P(A complement and B ...

*Saturday, September 6, 2014 by Rebekah*

**statistics**

How do I go about finding the answer to this type of question? Find the standard score (z) for which 50% of the area under the normal curve is below the mean.

*Friday, September 5, 2014 by MissPatte*

**statistics**

Four girls (say I, II, III and IV) are to rank 3 different types of cake (say A, B and C) in a blindfold test. Each girl ranks the three cakes as 1 (for the cake she likes the best), 2 and 3, and then the assigned ranks of each type of cake are summed. Assume that each girl is...

*Friday, September 5, 2014 by sam*

**statistics**

An urn contains 10 balls of which 6 are white, 3 are red and 1 is green. Two balls are drawn at random from the urn. Find the probability distribution of number of white balls drawn. Hence state the expected number of white balls one can get in such a draw.

*Friday, September 5, 2014 by sam*

**statistics**

let E,F and G be three events. state expressions fo rthe events. a. only F occurs b. exactly two of the events occur. c. at leasat one of the events occur. d. E and G occur but F does not. how do I go about writing these. do I use like union and intersection?

*Friday, September 5, 2014 by sara*

**statistics**

There are four children of dierent ages in a family. Their mom purchases six dierent gifts and decides to divide the gifts randomly between the children. Assuming that a child can receive no gift or multiple gifts, Thinking only about the number of gifts received by each ...

*Friday, September 5, 2014 by kety*

**statistics**

The mean height of students in a college is 155 cms and standard deviation is 15. What is the probability that the mean height of 36 students is less than 157 cms

*Thursday, September 4, 2014 by Anonymous*

**Statistics**

A sample of 12 measurements has a mean of 37 and a standard deviation of 4.25. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 37 each. A. Find the mean of the sample of 14 measurements. Mean = 37 How I ...

*Thursday, September 4, 2014 by Anonymous*

**statistics**

A state administered standardized reading exam is given to eighth grade students. The scores on this exam for all students statewide have a normal distribution with a mean of 507 and a standard deviation of 60. A local Junior High principal has decided to give an award to any ...

*Thursday, September 4, 2014 by Brandy*

**statistics**

Assign your numbers for mean μ and standard deviation σ. Then select one number "a" bellow μ and one number "b" above μ. Choose these numbers not far from μ so we can use z. Find probability that x is between a and b: P(a < x < b)

*Thursday, September 4, 2014 by Annie*

**statistics**

A state administered standardized reading exam is given to eighth grade students. The scores on this exam for all students statewide have a normal distribution with a mean of 506 and a standard deviation of 69. A local Junior High principal has decided to give an award to any ...

*Thursday, September 4, 2014 by Anonymous*

**statistics**

The final mark in QTQ100T has a normal distribution with an average of 60% and a variance of 100. If we draw a sample of 4 students, the probability that the average mark is more than 56% is

*Thursday, September 4, 2014 by Anonymous*

**statistics**

24. Rosalie Friend (2001), and educational psychologist, compared three methods of teaching writing. Students were randomly assigned to three different experimental conditions involving different methods of writing a summary. At the end of the two days of instructions, ...

*Tuesday, September 2, 2014 by Anonymous*