# a simple random smaple of 55 mathematics teachers were timed as they completed sudoku puzzles. Their mean completion time was 20.3 minutes. The population standard deviation is assumed to be 12 mintues and times vary normally. Find 99% confidence interval

13,909 results
1. ## Maths

Among the examinees in an examination 30%, 35% and 45% failed in Statistics, in Mathematics, and in at least one of the subjects respectively. An examinee is selected at random. Find the probabilities that a. He failed in Mathematics only b. He passed in

2. ## Math

A group of teachers and pupils attended a concert. The teachers paid \$1200 altogether and the pupils paid \$640 altogether for their tickets. The price of an adult ticket was \$60 and there were 4 more female teachers than male teachers. How many male

3. ## Math

A letter from the word MATHEMATICS is chosen at random. What Is the probability that the following letters are chosen S

4. ## statistics

A group of 50 teachers and school administrators attended a convention. If any two persons are picked at random, at least one of the two would be a teacher. From this information, what percentage of the people at the convention were teachers? Could someone

5. ## Math: Geometry

Of 162 students honored at an academic awards banquet, 48 won awards for mathematics and 78 won awards for English. There are 14 students who won awards for both mathematics and English. A newspaper chooses a student at random for an interview. What is the

6. ## statistics

Women comprise 80.3% of all elementary school teachers. In a random sample of 300 elementary teachers, what is the probability that more the 3/4 are women?

7. ## math

Brian has been making octagonal wooden puzzles. He wants to make some hexagonal puzzles next. By how much does he needs to increase or decrease the angle measure on his template to make the hexagonal puzzles? A. increase by 15 degrees B. decrease by 15

8. ## GEOMETRY

A letter is chosen at random from the word mathematics. what is the probability of choosing either a T or an M? A) 4/11 B) 3/11 C) 1/11 D) 2/11

9. ## 7th grade math (probability)

I'm not sure how to answer this: 3. THe 7th grade wants to have a back-up representative just in case the first teacher is absent. Based on the same scenario as #2, if a math teacher was chosen to be the 7th grade representative, what is the probablility

10. ## IGNOU probability

Among the examinees in an examination 30%, 35% and 45% failed in Statistics, in Mathematics, and in at least one of the subjects respectively. An examinee is selected at random. Find the probabilities that a. He failed in Mathematics only b. He passed in

11. ## math

A group of mathematics teachers went to a restaurant. They agreed to split the bill equally. When the bill arrived, two of them discovered that they had forgotten their money. The others in the group agreed to make up the difference by paying an extra

12. ## Statistics

An economist found that a random sample of 42 high school teachers had an average annual salary of \$56,490. A previous study showed that the population standard deviation is \$4150. Calculate the margin of error, E, for a 99% confidence interval for µ, the

13. ## English

Identify the sentence in each group in which the underlined verb does NOT agree with its subject. A. Everyone in Max’s family like to do jigsaw puzzles. B. One of the puzzles is missing a corner piece. C. Both of Max’s cousins are searching for it on

14. ## mathematics

a simple mathematics SBA topic???

15. ## Algebra

Randy, Sam, Tim and Will counted the number of puzzles they had solved in two months. Sam has solved twelve more than Tim. Randy had solved seventeen less than Sam.Will had solved twice as many as Randy. They have solved a total of 267 problems. How many

16. ## NEED HELP PLZ!!! STATS

Three cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of tens drawn in a set of 3 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this

17. ## math

Find each probability for choosing a letter at random from the word MATHEMATICS. P(vowel) 4/11?

18. ## stat

The heights of young American women, in inches, are normally distributed with mean mu and standard deviation 2.4 (sigma). I select a simple random sample of four young American women and measure their heights. The four heights, in inches, are 63 69 62 66

19. ## probability

A letter of english alphabets is chosen at random.What is the probability that it is a letter of the word MATHEMATICS.

20. ## Stats - Help!!!

A student wanted to know the favorite lunch at a large high school with a closed campus. What is the first step in conducting a statistical study to answer the question? A. Select a random sample of students. B. State the goal of the study precisely. C.

21. ## mathematics

in a class, 156 students study science and mathematics.if they passed at least one subject and twice as many passed science as many passed mathematics and 75 passed in mathematics subjects, find how many passed in mathematics only.

22. ## Statistics

A committe of 5 members will be chosen from a group of 10 teachers and 5 students. What is the probability that the committee will have A) all teachers? B) 3 teachers and 2 students? C) 3 or 4 teachers?

23. ## Statistics

An economist found that a random sample of 42 high school teachers had an average annual salary of \$56,490. A previous study showed that the population standard deviation is \$4150. Find the 99% confidence interval for µ, the average annual salary of all

24. ## STAT

A college faculty consists of 400 men and 250 women. The college administration wants to draw a sample of 65 faculty members to ask their opinion about a new parking fee. They draw a simple random sample of 40 men and another simple random sample of 25

25. ## Mathematics

Among 500 freshmen pursuing a business degree at a university, 313 are enrolled in an economics course, 205 are enrolled in a mathematics course, and 153 are enrolled in both an economics and a mathematics course. What is the probability that a freshman

26. ## probability

out of 250 students interviewed at a community college, 90 were taking mathematics but not computer science, 160 were taking mathematics, and 50 were taking neither mathematics nor computer science. Find the probability that a student chosen at random was

27. ## statistics

7. In a certain survey, 30% of those questioned are given an incentive to complete the survey. Of those who receive incentives, 80% completed the survey. Of those who do not receive incentives, 25% completed the survey. a. Find the probability of getting

28. ## Math

Three cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of tens drawn in a set of 3 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this

29. ## 7th Grade English-Word Puzzles/Pictures

I need help with word pictures/puzzles.(1) head (no capitals or other words next to it, above or below it)...(2) yrooucrhkeasd (again, no words above, below or next to it) Thank you! I'm sorry, but I don't understand. Can you give us more details about

30. ## statistics

Among the 500 first year students of college, 270 students study computer science, 345 students study mathematics, and 175 students study both computer science and mathematics. If one student is selected at random, find the probability that he did not take

31. ## Statistics

A committe of 5 members will be chosen from a group of 10 teachers and 5 students. What is the probability that the committee will have A) all teachers? B) 3 teachers and 2 students? C) 3 or 4 teachers?

32. ## Probability

In a university, 30% of the students major in Business management, 25% major in mathematics and 10% major in both business management and mathematics. A student from this university is selected at random. A) what is the probability that the student majors

33. ## Probability

In a university, 30% of the students major in Business management, 25% major in mathematics and 10% major in both business management and mathematics. A student from this university is selected at random. A) what is the probability that the student majors

34. ## Applied Mathematics references

This is not a homework question. I'm trying to get help regarding a reference book. I'm planning to get do a math major at the university and Pure Mathematics,Applied Mathematics and Computer Science will be my main subjects. When I went through the

35. ## math

Three of these puzzles have more than one answer. Try to find all the possible answers for each puzzle. One of these puzzles is impossible. 1.My number is a factor of 20.It's also a factor of 30. 2.My number is a multiple of 10.It's also a factor 45. 3.My

36. ## statistics

a simple random smaple of 55 mathematics teachers were timed as they completed sudoku puzzles. Their mean completion time was 20.3 minutes. The population standard deviation is assumed to be 12 mintues and times vary normally. Find 99% confidence interval

37. ## The practice of working with school age children

Interacting with others, exercising imagination, sharing and taking turns, and trying out new roles are all benefits of A. fantasy play. B. piano lessons. C. chess, Sudoku, and crossword puzzles. D. tutoring. A.

38. ## The practice of working with school age children

Interacting with others, exercising imagination, sharing and taking turns, and trying out new roles are all benefits of A. fantasy play. B. piano lessons. C. chess, Sudoku, and crossword puzzles. D. tutoring. D.

39. ## math

A puzzle expert wrote two new sudoku puzzles. He made \$950 selling the books. The hardcover books were \$3 while the softcover books were \$2.50. If he sold 350 books, how many of each did he sell? How do I set this up?

40. ## Algebra

What does it mean to be "simplified" which one is most "simple" 2(3+5) or 6 + 10 ??? I've been told both and wonder if someone can give me the correct answer some of my teachers told me simplified means all of the operations that can be done are done and

41. ## statistics

Would it be appropriate to use a random number table to select a digit for each blank square in sudoku

42. ## math

if m set of 22 mathematics teachers and p is the set of 25 physics teachers and if 2 teachers both mathematics and physics, how many elements has MUP.

43. ## Basic Statistics

A population of 300 voters contains 147 Republicans, 135 Democrats, and 18 independents and members of other parties. A simple random sample of 30 voters will be drawn from this population. Consider repeatedly drawing simple random samples of size 30 from

44. ## math

a box holds 23 puzzles. How many boxes are needed to hold 238 puzzles?

45. ## Math

Marisss completes 4 to 6 jigsaw puzzles a year. Estimate how many years it will take Marissa to complete 20 puzzles.

46. ## Statistics

A college admissions officer takes a simple random sample of 103 entering freshmen and computes their mean mathematics SAT score to be 493. Assume the population standard deviation is 112. What is the lower bound of the 99% confidence interval? Round your

47. ## Statistics

I have won exactly 72% of the 2400 puzzles that I played. What is the minuimum number of puzzles I must win before I have to win 73% of the total number of puzzles played?

48. ## Stats

In designing an experiment involving a treatments applied to 5 test subjects, researchers plan to use a simple random sample of 5 subjects from 28. How many different simple random samples are possible?

49. ## college stats

help please!!! 1. The average number of bumped passengers per day on FliRite Airlines is 2.47 with a standard deviation of 1.75. For a random sample of 40 days, what is the chance the average number of bumped passengers in the sample is between 2 and 2.75?

50. ## statistics

A large school district would like to estimate the mean score for all of its 5th grade students on a certain mathematics achievement test known to produce scores that are normally distributed in this population. In a pilot study, n = 25 randomly selected

51. ## math

There were 29 students who completed a survey. There were 15 boys and 14 girls. One survey was picked at random. To the nearest hundredth, what is the probability it was completed by a girl? A.0.48 B.1.93 C.0.52 D.0.93

There were 31 students who completed a survey. There were 13 boys and 18 girls. One survey was picked at random. To the nearest hundredth, what is the probability it was completed by a girl?

53. ## math

There were 25 students who completed a survey. There were 11 boys and 14 girls. One survey was picked at random. To the nearest hundredth, what is the probability it was completed by a girl?

54. ## statistics

What is wrong with the statement: It is believed that the proportion of Middle School teachers who leave the profession within 5 years is different from the proportion of High School teachers who leave the profession within 5 years. Test with a level of

55. ## Maths

what are the meanings of Mathematics of Buying and Mathematics of Selling, using language from the Business Mathematics aspect.

56. ## statistics

Two cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of Jacks drawn in a set of 2 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this

57. ## Stats

Three cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of tens drawn in a set of 3 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this

58. ## math

Riena has six unmarked CDs in a box, where each is dedicated to exactly one of English, mathematics, French, American history, chemistry, and computer science. Answer the following questions: a. If she chooses a CD at random, what is the probability she

59. ## math

Would this be a good resource for my students? This website? Yes, I believe so. We have several people who are very good at helping students with their math homework questions, from elementary school through college levels. Be sure to check out the

60. ## EED 364

1) Observe an elementary mathematics lesson. Write an essay of 1,500-1,750 words that addresses the following issues and summarizes your observations: a) What is the importance of having standards in mathematics? How do standards improve mathematics

61. ## English

The _______ form of a verb should be used to distinguish between actions completed in the immediate past and actions completed before a specific time. A. past perfect B. simple past C. irregular D. infinitive

62. ## Statistics (Verify My Answers)

If I do a research project and my hypothesis is that attitudes of human services providers towards HIV/AIDS would improve after participation in a program would my sampling method be simple random, stratified or cluster sampling? I think it would be simple

63. ## math

A school has three grade 10 classes. In how many ways can 3 out of 8 mathematics teachers be allocated to the classes?

64. ## Math

lisa checks the stats for her favorite puzzle game on her Ipod. she sees that she has won exactly 72% of the 2400 puzzles that she has played. what is the minimum numbers of puzzles that lisa must win before she has won at least 73% of the total number of

65. ## Math Essay

I have to write this paper over the history of math, can you please give me some other websites that I can use? So far I have one website from wikipedia. Also, can you please read my introduction? As of today, there are plenty of new developments in the

66. ## Math

The campaign manager for one of the five candidates running for office in a city wants to conduct a survey to see how popular his candidate is among all voters in the city. He chooses the first name on a voter registration list at random and then goes

67. ## Math

How can you classify the 2 examples that you gave in part c? Is it: Simple random sample Systematic random sample Voluntary response sample Convenience sample Or Stratified random sample? Thank you.

68. ## Statistics

A study in England attempted to determine the "right" method for teaching mathematics. A random sample of 248 students was chosen from the school at large. The students were randomly assigned to one of two classes. At the beginning of the research, the

69. ## Probability

A committe of 5 members will be chosen from a group of 10 teachers and 5 students. What is the probability that the committee will have A) all teachers? B) 3 teachers and 2 students? C) 3 or 4 teachers?

70. ## math

..... Amy finished 6/12 of the problems on her timed test. Jackson finished 4/6 ... the timed test. Did they finish the same fraction of the problems? Explain. ...

71. ## Statistics

A mathematics education researcher is studying where in high school mathematics texts it is most effective to insert questions. She wants to know whether it is better to present questions as motivation before the text passage, or after the passage. The

72. ## Mathematics

Of the 82 pupils in grade 9, 73 take mathematics 56 take science, all those who take science take mathematics. Show the information on the venn diagram. How many take neither mathematics nor science?

73. ## Mathematics

In a shool,7/10 of the pupils like mathematics.Half of those pupils who like mathematics are girls.If there areither 240 pupIlsley altogether in the school,how many girls like mathematics.

74. ## statistics

Suppose you are trying to estimate the percent of women in a city. Other things being equal, a simple random sample of 0.1% of the population of a city that has 2,000,000 people is ________ as a simple random sample of 0.1% of the population of a city that

75. ## statistics

Suppose you are trying to estimate the percent of women in a city. Other things being equal, a simple random sample of 0.1% of the population of a city that has 2,000,000 people is ________ as a simple random sample of 0.1% of the population of a city that

76. ## University studies

According to the Center for Mathematics Excellence, which of the following is a math myth? A. Knowing the rules and how to use them is the most important part of math. B. Even people who are highly skilled in mathematics and science find these subjects to

77. ## Math

Scummydale Senior High School has 8 math teachers and 4 history teachers. Suppose that a committee of 8 of those teachers is formed to attend a local conference.

78. ## Math

The ratio of female teachers to male teachers in a junior school is 13:5. if there are 48 more teachers than the male teachers, find the total numbers of teachers in junior school?

79. ## Math

Amy finished 6/12 of the problems on her timed test. Jackson finished 4/6 of the problems on the timed test. Did they finish the same fraction of the problems? Explain.

80. ## statistics

Four jelly beans are selected, one at a time from a bowl containing 6 black, 6 red and 6 green jelly beans. Let x represent the number of black jelly beans selected in 4 draws from the bowl. (A) If this experiment is completed without replacing the jelly

81. ## Probability

A school has 8 math teachers, 6 English teachers, and 2 geography teachers. From this group, a 5 teacher committee is required. Calculate the number of ways that this committee can be formed if at least one geography teachers must be on the committee.

82. ## spanish

so i tried doing this one: "¿Te gusta hascer rompecabezas?" "¡No! Hacer rompecabezas no es mi _____ favorita." a. liga b. crucigrama c. diversión d. campeona i know the first part of the question is asking, "Do you like to do jigsaw puzzles?" the answer

83. ## Economics

Pretend you are a superintendent of a school district and you have to hire new teachers and cut a few substitute teachers. If the number of substitute teachers you release is greater than the number of new teachers you plan to hire, explain to the school

84. ## Stor

Here is a simple way to create a random variable X that has mean μ and stan- dard deviation σ: X takes only the two values μ−σ and μ+σ, eachwith probability 0.5. Use the definition of the mean and variance for discrete random variables to show that

85. ## mathematical

Having mathematical standards in grades K-12 will give students clear and realistic expectations of what they are expected to learn in mathematics. The following solution explains this importance for students as well as the impact standards have on what

86. ## Statistics

City A has 1,000,000 people; City B has 4,000,000 people. Suppose the goal is to try to predict the percent of Purple Party voters in a sample. Other things being equal, a simple random sample of 1% of the people in City A has about the same accuracy as a

87. ## concept development

Which of the following is not a reason to make mathematics and science instruction relevant? A. To protect schools from being sued for discrimination B. To consider diversity in race, ethnicity, social class, and gender C. To build on concepts that

88. ## math

a letter from the word mathematics is chosen at random.what is the probability that the following letters are chosen s

89. ## Math

Carol wanted to know about how much time students in her school spent surfing the Internet. So she asked 15 of her friends to complete a survey that she had prepared. Will the results of Carol’s survey represent the population of students in her school

90. ## To Jiskha

I have one question: Whatever happened to the Instant Messaging thing which helped me alot when I was doing my homework? I wish that you could put it back on. My friends and I which I recommended to the site loves the message boards but they are not fast

91. ## English

Read each sentence then write whether the sentence is simple or not simple My dog Buddy fetches the paper in the morning Simple The subway which runs under the city is a fast way to travel Not simple Cici sings in the school choir simple Jen talks on the

92. ## Pharmacist information

Pharmacists who are trained in the United States must earn a Pharm.D. degree from an accredited college or school of pharmacy. The Pharm.D. degree has replaced the Bachelor of Pharmacy degree, which is no longer being awarded. To be admitted to a Pharm.D.

93. ## chemistry

Anyone good at making CHEMICAL CROSSWORD PUZZLES ? I have no clue on like any of these things. Like, i need to make the chemical crossword puzzles by using atleast 10 words! example: ....... TABLEEEEE! then ,,,,,,, ACROSS 1._______ 4._______ 7.________

94. ## math

In the fourth year of a school. There were 156 students who took both mathematics and science. They all passed at least one subject and 75 passed both subjects. If twice as many passed science as passed Mathematics, find how many passed in mathematics

If I take 0 out of arithmetic then what do I have left mathematically? What is the name for the mathematics that does not have zero in it? Is this mathematics used in the real world?

96. ## Math

Megan completes most puzzles in 24 minutes. Hassan completes most puzzles in 16 minutes. If Megan and Hassan complete a puzzle together, how long will it take?

Brad filled in 24 out of 40 words on a crossword puzzle. Stewart filled in 15 out of 25 words on a different crossword puzzle. Which correctly compares the fractions of the puzzles that Brad and Stewart completed. a)2/3>3/5 b)3/53/5 d)3/5=3/5

98. ## maths

A deck of cards consists of 8 blue cards and 5 white cards. A simple random sample (random draws without replacement) of 6 cards is selected. What is the chance that one of the colors appears twice as many times as the other?

99. ## Algebra 1

Randy, Sam, Tim and Will counted the number of puzzles they had solved in two months. Sam has solved twelve more than Tim. Randy had solved seventeen less than Sam.Will had solved twice as many as Randy. They have solved a total of 267 problems. How many

100. ## Statistics

How large a smaple from a N(80,20) population is needed so that the sampling distribution of the mean has a standard deviation of 1?