Statistics代写 – 统计学代写 – 概率模型代写 – final exam代写
statistics代写

Statistics代写 – 统计学代写 – 概率模型代写 – final exam代写

Class activity 9

Final exam review

 

 

statistics代写 At a large university, the number of student problems handled by the dean of student affairs varies from semester to semester. The ···

 

Questions 1 – 3 are based on the following description: statistics代写

At a large university, the number of student problems handled by the dean of student affairs varies from semester to semester. The following table gives the probability model for the number of student problems handled by the dean for a semester.

 

Number of Student Problems 0 1 2 3 4 5
Probability 0.25 0.30 0.20 0.05

 

  1. The probability that the dean handles zero student problems is equal to the probability that the dean handles onestudent problem. For this to be a valid probability model, what is the probability that the dean handles zero student problems in a given semester?

 

  1. A)20
  2. B)15
  3. C)80
  4. D)10

 

  1. Whatis the probability that the dean handles no more than three student problems in a given semester?

 

  1. A)25
  2. B)55
  3. C)75
  4. D)00

 

  1. Whatis the probability that the dean handles at least 4 student problems in a given semester? statistics代写

 

  1. A)25
  2. B)55
  3. C)75
  4. D)20

 

  1. What is the point estimate of the population mean amount of time high school students spend with friends eachweek?

 

  1. 7 hours
  2. 2 hours
  3. 195 hours
  4. 64 hours

 

  1. Construct a 90% confidence interval for the mean amount of time high school students spend with friends each

 

  1. A)(6.26, 7.14)
  2. B)(8.70, 9.70)
  3. C)(9.19, 9.21)
  4. D)(8.88, 9.52)

 

  1. Whatcollection of outcomes represents the complement of event C?  statistics代写

 

  1. A){1,2, 3, 4, 5, 6, 7, 8, 9}
  2. B){1, 2, 3, 4,5, 6}
  3. C){1, 2}
  4. D){7, 8, 9}

 

  1. Whatis the probability of event A?

 

  1. A)4/9
  2. B)7/9
  3. C)1/2
  4. D)4/5

 

  1. Areevents B and C mutually exclusive?  statistics代写

 

  1. Yesbecause they have no outcomes in
  2. Yesbecause they have outcomes in
  3. Nobecause they have no outcomes in
  4. Nobecause they have outcomes in common.

9.Calculate the margin of error for the 70% confidence interval for the proportion of workers that got their jobsthrough  The estimate of the         standard deviation is 0.0184.

  1. A)00035
  2. B)0361
  3. C)0191
  4. D)1412

 

  1. The70% confidence interval is (0.5909, 6291). Select the appropriate interpretation of the confidence interval.

 

  1. We are 70% confident that the proportion of the randomly sampled workers that got their jobs throughnetworking is between 0.5909 and 0.6291.
  2. We are 70% confident that the proportion of all workers that got their jobs through networking is between5909 and 0.6291.
  3. We are 70% confident that the proportion of the 429 workers that got their jobs through networking is between5909 and 0.6291
  4. Weare 70% confident that the proportion of all workers that got their jobs through networking is 61.

 

  1. Whattype of graph should be used to show the relationship between waist circumference and body mass index? statistics代写

 

  1. Two-WayTable
  2. Scatterplot
  3. Boxplot
  4. PieChart

 

  1. Whatis the value of R?

 

  1. A)731
  2. B)925
  3. C)297
  4. D)855

 

  1. Whatproportion of the variation in body mass index is explained by the relationship with waist circumference?

 

  1. A)731
  2. B)925
  3. C)297
  4. D)855

 

  1. Howmuch is body mass index expected to change for each centimeter increase in waist circumference?

 

  1. A)– 1.16
  2. B)925
  3. C)297
  4. D)855

 

  1. Select apractical interpretation of the  statistics代写

 

  1. Weexpect the body mass index of a woman with a waist circumference of 297 to equal – 1.16.
  2. The value of – 1.16 has no practical interpretation since a waist circumference of 0 and a negative body massindex are nonsensical.
  3. For each1 centimeter increase in waist circumference, body mass index is expected to decrease by 16.
  4. Waistcircumference is expected to decrease by 16 for every unit increase in body mass index.

 

  1. Predictthe body mass index of a woman with a waist circumference of 90.

 

  1. A)67
  2. B)57
  3. C)00
  4. D)66

 

  1. Thenull hypothesis is Ho: p = 0.81. What is the alternative hypothesis?

 

  1. A)Ha:p > 81
  2. B)Ha:p ≠ 81
  3. C)Ha:p ≠ 83
  4. D)Ha: p >83

 

  1. Whatis the value of the sample proportion?  statistics代写

 

  1. A)835
  2. B)83
  3. C)81
  4. D)1006
statistics代写
statistics代写
  1. Whatis the mean of the sampling distribution of the sample proportion (assuming Ho is true)?

 

  1. A)835
  2. B)83
  3. C)81
  4. D)1006

 

  1. Whatis the standard deviation of the sampling distribution of the sample proportion (assuming Ho is true)?

 

  1. A)01184
  2. B)00015
  3. C)05
  4. D)01237

 

  1. Calculatethe test statistic of the hypothesis  statistics代写

 

  1. A)– 1.6
  2. B)6
  3. C)0548
  4. D)01237

 

  1. The p-value of the test is 0.1096.Is there sufficient evidence, at the 0.05 level of significance, to conclude that the percent of adults who have read at least one book in the last year is different from the 2005 value?

 

  1. Yes becausethe p-value is less than α = 0.05.
  2. Yesbecause the p-value is greater than α = 0.05.
  3. No becausethe p-value is less than α = 0.05.
  4. Nobecause the p-value is greater than α = 0.05.

 

 

Work Home Motor Vehicle Other Total
Male 18 26 4 36 84
Female 4 28 6 24 62
Total 22 54 10 60 146

 

  1. Whatis the probability that a randomly selected accident took place at work? statistics代写

 

  1. 18
  2. B)123
  3. C)214
  4. D)151

 

  1. Whatis the probability that a randomly selected accident involved a male, given the accident took place at work?

 

  1. A)214
  2. B)575
  3. C)818
  4. D)123

 

  1. Calculatethe expected count of accidents that involved males and took place at work. The actual count is 18.

 

  1. A)726
  2. B)66
  3. C)18
  4. D)34

 

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