Statistics

  1. Statistics (Box Method)
    I have two questions where I keep getting the last parts (question #1 [e], question #2 [f]) wrong. I have all the other answers right so I'm not sure what I am doing wrong with these two. I went ahead and wrote all the parts down as well as the answers and for the two I got ...
  2. statistics
    suppose that iq scores have a bell-shaped distribution with a mean of 97 and a standard deviation of 17. using the empirical rule, what percentage of iq scores are greater than 46? please do not round your answer.
  3. Statistics
    In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 25 patients using the is selected. Find the mean and standard deviation of patients having a mild side effect. I know the mean is 25(0.2)= 5 but I’m ...
  4. Statistics
    A certain organization recommends the use of passwords with the following​ format: consonant comma consonant, consonant comma vowel comma consonant comma vowel comma consonant comma number comma number consonant, vowel, consonant, vowel, consonant, number, number ​(for ...
  5. Statistics
    A certain curve (that is NOT the normal curve) is shown below. The curve is symmetric around 0, and the total area under the curve is 100%. The area between -1 and 1 is 58%. What is the area to the right of 1? I do not know how to do this because it is not a normal curve so I ...
  6. Statistics
    Solve this statistic question? A survey of 250 lobster fishermen found that they catch an average of 32.0 pounds of lobster per day with a standard deviation of 4.0 pounds. If a random sample of 36 lobster fishermen is selected, what is the probability that their average catch...
  7. Statistics
    Retired workers and disabled workers both receive Social Security benefits. What information would we need to test the claim that the difference in monthly benefits between the two groups is greater than $30 at the 0.05 level of significance? Write out the hypotheses and ...
  8. Statistics
    There are several advantages of using a paired t-test. Since the same subjects are being tested in each of the varying conditions, those subjects serve as their own control. This is a major advantage as you need not consider potential differences between the subjects in the ...
  9. Math Statistics
    Suppose you work for the quality control department at Hewlett Packard. You know that ink jet cartridges are sometimes defective. The current defective rate is 8 cartridges per package of 100 (i.e. 0.08) What is the probability of sampling 12 cartridges and finding: At least 4...
  10. Statistics (Probability)
    I just asked a question a few minutes ago. But this is the last two questions I need help with. I have tried a couple different answers for both and still can't seem to get the correct ones. Four draws are going to be made at random with replacement from the box 1 2 2 3 3 What...
  11. Statistics (Probability)
    Hi there! I have been working on this problem for quite a while and I keep getting it wrong. A deck is shuffled and three cards are dealt. (a) Find the chance that the first card is a king. Give your answer as a fraction. (b) Find the chance that the first card is a king, the ...
  12. Statistics
    A student group claims that first year students at a university study 2.5 hours (150 minutes) per night during the school week. A skeptic suspects that they study less than that on average. He takes a random sample of 30 first year students and finds that X=137 minutes and sx=...
  13. Statistics
    What would be an example with solution of the Poisson distribution in the frequency of repurchases?
  14. ELA
    Tips on taking notes are Put a bunch of information on one card, put the author’s name first, and summarize everything. Take accurate notes: don’t misinterpret the words, write facts to include examples, statistics, data and expert testimony, take quick notes by ...
  15. Statistics
    The correct size of a nickel is 21.21 millimeters. Based on that, the data can be summarized into the following table: Too Small-Too Large- Total Low Income 11 29 40 High Income 26 9 35 Total 37 38 75 Based on this data: (give your answers to parts a-c as fractions, or ...
  16. Statistics
    In a study of MP3 player popularity, 22% of people in a random sample of 1100 Americans age 12 and older indicated that they owned an MP3 player. The owners were 26% of the males and 18% of the females. Suppose that there were the same number of males and females in the sample...
  17. statistics
    According to Chebyshev's theorem, what proportion of a distribution will be within k = 4 standard deviations of the mean? Show all work as to how to find this.
  18. statistics
    The J.R. Simplot Company produces frozen French fries that are then sold to customers such as McDonald's. The "prime" line of fries has an average length of 6.00 inches with a standard deviation of0.50 inch. To make sure that Simplot continues to meet the quality standard for...
  19. Statistics
    Episodes of dehydration are common at outdoors music festivals. At a particular large annual event, a first aid team has recorded over the years 85 cases on average per day. In 2018, during a weekend they observe 78, 86, 79, and 81 cases. Assuming the distributions of cases is...
  20. statistics
    In the formula Σ (x – µ)^2/n for the variance, in what cases would we divide by n-1 instead of n?
  21. Statistics
    A 10-minute telephone call to London through AT&T cost $12 in 1976 and $14.10 in July 2015 using an occasional calling plan. In 1976, the CPI was 56.9, and in July 2015, it was 238.7. 1. In terms of July 2015 dollars, a call in 1976 costs $____. (Give your answer to 2 decimal ...
  22. Math/Statistics/Probability
    Leroy and Fred play chess at a club every Wednesday. The probability that Leroy will lose is .3, that he will stalemate is .5, and that he will win is .2. The probability that Fred will lose is .25, that he will stalemate is .4, and that he will win is .35. What is the ...
  23. Math
    The students in Mrs. Garcia's class will sell magazine subscriptions to raise money for the new playground equipment. The statistics from the magazine company show that one out of every 5 people asked will buy a subscription. Based on the company's statistics if Marcia asks ...
  24. Statistics
    Episodes of dehydration are common at outdoors music festivals. At a particular large annual event, a first aid team has recorded over the years 85 cases on average per day. In 2018, during a weekend they observe 78, 86, 79, and 81 cases. Assuming the distributions of cases is...
  25. Statistics
    Consumers own laptops of brand X for a certain amount of time before buying a new model. This time duration has a distribution with unknown mean and standard deviation 1.5. The company X expects that consumers will keep their laptop or 3.5 years. After collecting a sample of ...
  26. Statistics
    Is it appropriate to quantify the expected response rates by ethnic group using a simple random sample as the test's sampling plan?
  27. Statistics
    An American roulette wheel has 38 slots, of which 18 are black, 18 are red, and 2 are green. When the wheel is spun, the ball is equally likely to come to rest in any of the slots. Gamblers bet on the roulette by placing chips on a table that lays out the numbers and colors of...
  28. Statistics
    Alec is taking a Statistics class and a Geography class. The probabilities that he passes these two classes are independent. The probability of him passing his Statistics class is 0.95. The probability of him passing his Geography class is 0.74. What is the probability he ...
  29. statistics
    How large a sample should be taken if the population mean is to be estimated with 99% confidence to within $75? The population has a standard deviation of $900.
  30. Statistics
    Suppose flights at a large metropolitan airport are on-time 68% of the time and late 32% of the time. We want to use a table of random digits to simulate flight status (on-time or late), so we'll assign 01, 02, … , 68 to represent on-time flights, and 69, 70, … , 99, 00 to...
  31. Statistics
    What is a diagram that shows the frequency of data on a number line. I honestly don't know.
  32. English (Comprehension)
    Good morning! I'm having difficulty with this question on my practice sheet, and I wanted a second-hand opinion, any help is appreciated. Read this excerpt: One-eighth of the whole population were colored slaves, not distributed generally over the Union, but localized in the ...
  33. Statistics
    A psychologist studied the time x (in seconds) it took a subject to complete a pencil and paper maze while in the presence of a floral scent. Suppose x has a normal distribution with mean 70 seconds and standard deviation 15 seconds. Find P(X<58)
  34. Statistics
    A psychologist studied the time x (in seconds) it took a subject to complete a pencil and paper maze while in the presence of a floral scent. Suppose x has a normal distribution with mean 70 seconds and standard deviation 15 seconds. Find P(X<58)
  35. Statistics
    Suppose x is the waiting time at a bank, which is a random variable that is uniformly disturbed on values between 0 and 20 minutes. Find the probability that the waiting time is between 5 and 10 minutes.
  36. AP Statistics
    The game Chuck-A-Luck is played as follows: A player bets $M on an integer chosen from 1-6 and then rolls three dice. If the number appears on exactly on die, then the player wins the amount bet. The player wins twice the amount bet if the umber appears on two dice and three ...
  37. AP Statistics
    Italian gamblers used to bet on the total number of dots rolled on three six-sided dice. They believed the chance of rolling a nine ought to equal the chance of rolling a total of 10 since there were an equal number of different ways to get each sum. However, experience showed...
  38. AP Statistics
    I really need help on this question. When dealing out a game of thirteen, what is the probability of getting an insta-win. This of course includes a bomb of 2s, a 12 long straight, and any other insta-wins that are present in the game. Please answer because I need to finish a ...
  39. Marketing
    Need links or any information on my product which is energy drinks with biodegradable packaging and our target market are students , could be college or high school? any information on the product and statistics that lead up to why the target market matters.
  40. Marketing
    For my project I am working on why my jeep wrangler is designed for my target market which is between 25-35, adults with young kids, adventurous, fun, family oriented. And I need to provide statistics or evidence that shows that my target market isnt made up and I need ...
  41. ELA
    Asthma Centers for Disease Control, Asthma, FAQs What Asthma Is 1 Asthma is a disease that affects your lungs. It is the most common long-term disease of children. It causes repeated episodes of wheezing, breathlessness, chest tightness, and nighttime or early morning coughing...
  42. math statistics
    A machine has 9 identical components that function independently. The probability that a component will fail is 0.2. The machine will stop working if 1 or 2 components fail. Find the probability that the machine will be fail?
  43. Math
    Steel Factory Workers Ages Mean: 42 Median: 38 Range: 52 Mean Deviation: 11.23 Shift 1 18 25 56 42 29 38 54 47 35 30 Shift 2 23 19 50 49 67 34 30 59 40 33 Shift 3 19 22 24 40 45 29 33 29 39 59 Shift 4 21 23 25 40 35 19 70 40 22 23 The summary statistics for all of the workers ...
  44. statistics
    A population has an average of 150,000 with a standard deviation of 27,000. A random sample of 81 items is chosen. What is the standard error?
  45. Statistics and Probability
    Let Y be the discrete random variable with probability function p(y) = (1/2)^(y+1) y = 0, 1, 2,... Find the moment-generating function m(t) for Y.
  46. Statistics and Probability
    Teams A and B play a series of games with the first team to win 4 games being declared the winner of the series. Suppose that team A independently wins each game with probability 0.6. Find the probability that team A wins the series.
  47. Statistics
    consider b1=100 and b0=5, this gives us the estimated regression equation of y=100x+5 Find the estimated standard deviation of b1 and the corresponding t-statistic. a.)At the 1% level of significance, can you reject the null hypothesis? Make sure you state the null and ...
  48. Statistics
    Teen Communication The following data represent the number of different communication activities (e.g., cell phone, text messaging, e-mail, Internet, and so on) used by a random sample of teenagers over the past 24 hours. (a) Are the events “male” and “0 activities” ...
  49. Statistics Math
    . Drawing a Card Suppose that a single card is selected from a standard 52-card deck. What is the probability that the card drawn is a club? Now suppose that a single card is drawn from a standard 52-card deck, but we are told that the card is black. What is the probability ...
  50. Statistics
    . According to the U.S. Census Bureau, the probability that a randomly selected head of household in the United States earns more than $100,000 per year is 0.202. The probability that a randomly selected head of household in the United States earns more than $100,000 per year...
  51. Statistics
    Suppose that suppose that e and f are two events and that p(e)=0.8 and p(f/e)=0.4. what is p(e and f)?
  52. Math
    a. Do some research and find a city that has experienced population growth. Determine its population on January 1st of a certain year. Write an exponential function to represent the city’s population, y, based on the number of years that pass, x after a period of exponential...
  53. Math Statistics
    Lottery: I buy one of 250 raffle tickets for $5. The sponsors then randomly select 1 grand prize worth $250, 2 second prizes worth $100 each, and 3 third prizes worth $50 each. Below is the discrete probability distribution for this raffle. Prize P(x) Grand 1/250 Second 2/250 ...
  54. Statistics
    A. In a given normal distribution, the sample mean is 75 and the sample standard deviation is 4. Find the corresponding standard score of the following values: 1. 69 2. 85 3. 70 4. 65 B. In a given normal distribution, the population standard deviation is 2.5. Find the ...
  55. Statistics
    (GRAPH) Sketch a normal curve that has a mean of 15 and a standard deviation of 4. On the same x-axis, sketch another normal curve that has a mean of 25 and a standard deviation of 4. Describe the two normal curves.
  56. Statistics
    Find the area under the normal curve in each of the following cases. 1. Between z = 0 and z = 1.63 2. Between z = 1.56 and = 2.51 3. Between z = -0.76 and z =1.35 4. Between z= -0.26 and z = -1.76 5. To the left of z = 2.35 6 To the right of z = -1.31 7. To the left of z = 0....
  57. Statistics
    The Random Variable X is normally distributed with mean 560 and standard deviation 20. Find P(X<530) which I calculated as 0.0668. However... It is known that p(|X-560|<a) Find the value of a
  58. statistics
    H0 is p = 0.45 and H1 is p ≠ 0.45. What type of test wil​l be performed? A. Two-tail testing of a proportion B. One-tail testing of a proportion C. One-tail testing of a mean D. Two-tail testing of a mean ** I'm stuck between A & D. I chose those because two-...
  59. statistics
    Determine which of the following four population size and sample size combinations would not require the use of the finite population correction factor in calculating the standard error. A. N = 1500; n = 300 B. N = 2500; n = 75 C. N = 15,000; n = 1,000 D. N = 150; n = 25 I ...
  60. CASE STUDY HYPOTHESES
    CASE STUDY HPOTHESES? Is it logically inconsistent to use statistics to illustrate white privilege, but not to support racial profiling? What can the legal evidence collection process learn from the strength and weaknesses of the ethnographic research method? What can ...
  61. Research Questions on Racial Profilig?
    My assignment is to write a case study, I plan on writing about racial profiling. Are these questions workable? 1. What can the legal evidence collection process learn from the strength and weaknesses of the ethnographic research method? What can ethnographers learn from the ...
  62. statistics
    You have been asked to do a survey of student satisfaction with MyMathLab courses at South University. Describe how you would obtain a sample of these types: stratified and simple random
  63. statistics
    A cereal manufacturer seeks to test their newest product against a competitor’s. A group of 100 children was asked to evaluate each brand, and then to express a preference. To guard against bias, neither the children, nor the technicians serving them, were aware of the order...
  64. Statistics
    Which Professor? Suppose Professor Alpha and Professor Omega each teach Introductory Biology. You need to Decide which professor to take the class from and have just completed your introductory statistics course. Records obtained from the past students indicated that students ...
  65. Statistics
    Find the range population of Ethan and the population standard deviation Ethan: 9, 24, 8, 9, 5, 8, 9, 10, 8, 10
  66. Statistics
    The normality of NaOH obtained was 0.0172, 0.0187, 0.0185, 0.189, and 0.0183 N. The theoretical normality of NaOH was 0.02 N. Please calculate: 1) Standard deviation based on the true mean: 2) Standard deviation based on the experimental mean: SD 3) Coefficient of variation (...
  67. Probability & Statistics
    Space shuttle astronauts each consume an average of 3000 calories per day. One meal normally consists of a main​ dish, a vegetable​ dish, and two different desserts. The astronauts can choose from 11 main​ dishes, 7 vegetable​ dishes, and 12 desserts. How many ...
  68. Statistics
    I'm trying to figure out which type of factorial ANOVA test to use for this data. The data is from a hypothetical study looking at whether males or females are more likely to ask questions during a seminar where people give various presentations. The dependent variable is "...
  69. Statistics
    Question 1 - Use the dataset InkjetPrinters.txt to answer the following questions: Data was collected on a sample of 20 different consumer inkjet printers. The dataset contains 5 different properties: Variable Description Printing rate (PPM) Printing rate (pages per minute) ...
  70. Statistics
    Volunteers for a human performance study were randomly divided into two groups. The first group had their flexibility measured in the morning after a short meditation session while the second group had their flexibility measured in the afternoon with no previous meditation ...
  71. Probability and statistics
    For a single roll of two dice, are rolling a sum of 6 and rolling doubles independent events? Explain. 
  72. English
    17. For most academic writing, the types of evidence preferred include A. a combination of assertions and first-hand experiences. B. personal observations and opinions. C. facts, statistics, and expert testimony. D. general statements and quotations by well-known individuals...
  73. Statistics
    Graph neatly and label all intercepts. -x+2y=5 x intercept x=0 -0+2y=5 +0 +0 -------- 2y/2=5/2 y=5/2 y intercept y=0 -x+2(0)=5 -x+0=5 -x-0=5 x=-5
  74. Statistics
    1. The following sample data shows the use of plastic (debit and credit) cards versus cash/cheque by four age groups: Age Group 18-24, 25-34, 35-44, 45 and over Payment Method plastic 21, 27, 27, 36 cash or cheque 21, 36, 42, 90 Test for independence between method of payment ...
  75. Statistics
    For the given pair of events A and​ B, complete parts​ (a) and​ (b) below.   ​A: When a page is randomly selected and ripped from a 2121​-page document and​ destroyed, it is page 1515. ​B: When a different page is randomly selected and ripped from the​ ...
  76. Statistics
    A certain player makes a successful first serve 80% of the time. Assume that everything is independent. The propbability that she gets at least 4 serves in is_____? and that she gets no more than 3 serves in is_____?
  77. math - statistics
    There has been a rise in supermarket-owned brands in Australia. These are commonly available in supermarkets such as Woolworths, Coles and Aldi. It has been said that these brands account for almost one-quarter of all grocery sales. It has also been claimed that the quality of...
  78. Statistics
    A 2014 Gallup Poll of 1028 adults found that 216 thought abortion should be illegal in all circumstances, a decrease of 2 percentage points from the record high in 2009. We are 95% confident that between ___% and ___% of all adults thought abortion should be illegal in all ...
  79. Statistics
    A 2014 Gallup Poll of 1028 adults found that 216 thought abortion should be illegal in all circumstances, a decrease of 2 percentage points from the record high in 2009. We are 95% confident that between ___% and ___% of all adults thought abortion should be illegal in all ...
  80. Statistics
    H(o): u=10 H(o): u>10 (sigma)=2 n=25 In your research, you will fail to reject the null hypothesis if your sample average is less than 10.82 a) What is the probability of making a Type II Error if the true value of "u" is 10.26? b) What is the power of this test? Thank you!
  81. Statistics
    In a village with a population of 1500,the probability of a person falling sick is 0.002. Find the probability that a)3people fall sick in a week b)less than 3 fall sick in a week c)at most 3 fall sick in a week d)more than 2 fall sick in a week
  82. Statistics and Probability
    A box contains 4 red and 5 blue marbles. Michele picks three marbles at random from this box. If Z is a random variable representing the # of blue marbles picked from the box, do the following. a. Express the probability mass function of Z in tabular form. b. Draw the ...
  83. statistics
    When a parachute is inspected, the inspector is looking for anything that might indicate the parachute might not open. - State the null and alternative hypotheses for this situation.
  84. statistics
    If the critical values of a hypothesis test are +2.58 and -2.58, what would be the critical regions?
  85. statistics
    if you counted 20 colonies from 0.01-ml inoculum of a 1:10 diulation of urine, how many organisms per milliliter of speciman would you report? Is this number significant
  86. Consumer Math
    Weights of the vegetables in a field are normally distributed. From a sample Carl Cornfield determines the mean weight of a box of vegetables to be 180 oz. with a standard deviation of 8 oz. He wonders what percent of the vegetable boxes he has grouped for sale will have a ...
  87. statistics
    The Maximum Error of Estimate is exactly equal to half of the width of the confidence interval. T-F, and why or why not?
  88. MC science history
    Which of the following is not considered part of the "golden age" of microbiology? A.First artificial vaccine is developed B.Gram stain is devised C, Viruses are defined D.all of the above Who determined Archaea are the third domain of life? A.Carl Woese B.Winogradsky C.Kary ...
  89. 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?
  90. statistics / probability
    A cooler full of sodas has 12 lemon-lime drinks and 18 gingerales. If one drink is selected at random and then a second drink is selected at random, what are the chances that both sodas will be gingerales?
  91. 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?
  92. AP Statistics
    I was sick and when I came back to school I received this question as homework and I don't understand it... Jenny is a 60 percent free-throw shooter She gets to shoot a second free throw if and only if she makes her first shot. She can score 0 points( if she misses her first ...
  93. statistics
    ⦁ Find the probability that a data value picked at random from a normal population will have a standard score (z) that lies between the following pairs of z-values. ⦁ z = 0 to z = 2.10 ⦁ X
  94. statistics
    Please help. I have no idea what I am doing Use the standard normal (z score) table to find: P(-1.00 ≤ z) & Find the probability that a data value picked at random from a normal population will have a standard score (z) that lies between the following pairs of z-values. z = ...
  95. statistics
    A box contains 10 items, of which 3 are defective and 7 are non-defective. Two items are randomly selected, one at a time, with replacement, and x is the number of defectives in the sample of two. Explain why x is a binomial random variable. & For the first question about the ...
  96. statistics
    A box contains 10 items, of which 3 are defective and 7 are non-defective. Two items are randomly selected, one at a time, with replacement, and x is the number of defectives in the sample of two. Explain why x is a binomial random variable
  97. Math
    A repeated-measures study and an independent-measures study both produce t statistics with df = 20. The independent-measures study used more participants. True or False
  98. statistics
    You have been asked to do a survey of student satisfaction with MyMathLab courses at South University. Describe how you would obtain a sample of these types: stratified and simple random.
  99. statistics
    Please help. I have no idea how to do thisA cereal manufacturer seeks to test their newest product against a competitor’s. A group of 100 children was asked to evaluate each brand, and then to express a preference. To guard against bias, neither the children, nor the ...
  100. Statistics
    The yearly rainfall in Vancouver, B.C. follows a normal distribution with standard deviation 172 mm. In 20% of years, the city gets over 1200 mm of rain. What is the mean annual rainfall in Vancouver (in mm)? The answer is 1055.5 mm....not sure how to get this answer.
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