## CHECK THESE SAMPLES OF Statistics Problems

...Due **Statistics** Report II This study analyzed the number of phone calls made home by a small sample (n=40) of undergraduate students. In this study, the number of phone calls made home was the dependent variable, and both the year of the student (freshmen, sophomore, junior, or senior) and the gender of the student were independent variables. Because this study has two independent variables and one dependent variable, a factorial ANOVA design is most appropriate. The gender factor has two levels: male and female, and the year factor has four levels (freshmen, sophomore, junior, or senior), meaning we have a 4x2 ANOVA design. Because we have a 4x2 ANOVA design, one interaction effect is possible (between the gender and...

2 Pages(500 words)Research Paper

...?Because there are 50 numbers, we can divide these numbers into groups of 10 (5 groups). Next we subtract the lowest number from the highest number (76 — 16 = 60). After this, we will divide the difference by the number of groups that we came up with (60 / 5 = 12). Once we get the class width (12), we add it to the lowest number in order to get the lowest class limit (16 + 12 = 28). If we keep on repeating this step, we can determine all the appropriate class limits (28 + 12 = 40, 40 + 12 = 52, 52 + 12 = 64, and 64 + 12 = 76). Because these are the maximum limits, we have to subtract 1 from each class limit (16 + 12 — 1 = 27, 28 + 12 — 1 = 39, 40 + 12 — 1 = 51, 52 + 12 — 1 = 63). Now that we have worked this out, we can create... there are 50 ...

1 Pages(250 words)Math Problem

...**Problem** 2-15: Null Hypothesis (Ho Appearance of cell phones after twenty seconds in the mold is equal to appearance after ten seconds. Null Hypothesis (HA):
Appearance of cell phones after twenty seconds in the mold is better than appearance after ten seconds.
**Statistical** Test:
T-Test of Dependent Samples was conducted on data to conclude whether **statistical** significance exist to support that longer cool-down times results in fewer defects
Results:
P-value = .000
Conclusion:
P-value = .000 which is less than the set alpha level of .05. This concludes **statistical** significance and rejection of null hypothesis and acceptance of alternative hypothesis.
Appearance and...

14 Pages(3500 words)Essay

...**Statistics** **Problems** 21. What is sampling error? Could the value of the sampling error be zero? If it were zero,what would this mean? Sampling error is the error in the **statistical** figures that are obtained by using a representative sample of a population rather than examining the entire population. It is a measure of the differences between the sample selected and the whole population which are caused solely due to the selected units. In other words, it is a measure of the preciseness of the results obtained using the sample population.
Yes, the sampling error can be equal to zero. In this case, it will mean that the sample selected is an ideal representation of the entire population and the characteristics observed in the sample...

2 Pages(500 words)Speech or Presentation

...**Statistics** **Problems** 31. A new weight-watching company, Weight Reducers International, advertises that those who join will lose, on the average, 10 pounds the first two weeks with a standard deviation of 2.8 pounds. A random sample of 50 people who joined the new weight reduction program revealed the mean loss to be 9 pounds. At the .05 level of significance, can we conclude that those joining Weight Reducers on average will lose less than 10 pounds? Determine the p-value.
Hypotheses:
Null Hypothesis H0: µ = 10
Alternate Hypothesis H1: µ ≤ 10
Test **Statistic**:
z = (9 - 10) / (2.8 / √(50))
= -2.525
The p-value can be obtained from the z – table corresponding to -2.525.
p - Value:
p (z < -2.525) = 0.0058
As the p-value... is not...

3 Pages(750 words)Speech or Presentation

...1. Consider a population with and . (A) Calculate the z-score for from a sample of size 40. Z = (x- mu sigma = (40-67 5.76 = -4.70 (B) Couldthis z-score be used in calculating probabilities using Table 3 in Appendix B of the text? Why or why not?
No, because the maximum z-score that is reported on the table is -3.4, 3.4.
(Points : 4)
2. Given a level of confidence of 95% and a population standard deviation of 9, answer the following:
(A) What other information is necessary to find the sample size (n)?
Confidence interval or the margin of error
(B) Find the Maximum Error of Estimate (E) if n = 72. Show all work.
ME = 1.96(SD/ sqroot(N)) = 1.96(9/sqroot(72)) = 2.08
(Points : 4)
3. A sample of 134 golfers showed... Consider a population...

2 Pages(500 words)Speech or Presentation

...# 14
A researcher claims that the average age of people who buy lottery tickets is 65. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 9. At a= 0.01 is there enough evidence to reject the researcher’s claim? Show all work.
49
63
68
52
38
80
72
56
75
56
65
46
70
74
70
61
65
71
58
74
79
76
43
49
62
68
35
67
69
45
Solution:
Null and alternative hypothesis:
Ho: µ = 65
H1: µ ≠ 65
Level of significance:
0.01
Test **statistics**:
Z= (x-bar - µ)/S.E
Mean = ∑x/n = 1856/30 = 61.867
S.E = standard deviation / √n
S.E = 9/√30 =1.64
Z= (61.867- 65)/1.64
Z= -1.91
Critical region:
Value of z at a=0.01 in two tailed test is 2.56. So, critical region is -2.56 ≤ z ≤...

4 Pages(1000 words)Speech or Presentation

...Arithmetic and Geometric Sequences Submitted Introduction: The arithmetic and geometric sequence aretwo of the simplest sequences in mathematics. In arithmetic sequence, each successive term is derived by adding (or subtracting) a constant number. For example: 1, 4, 7, 10 and so on. In geometric sequence, each successive term is obtained by multiplying (or dividing) the previous term by a constant. For example: 2, 6, 18, 54 and so on.
Exercise 35
A person hired a firm to build a CB radio tower. The firm charges $100 for labor for the first 10 feet. After that, the cost of the labor for each succeeding 10 feet is $25 more than the preceding 10 feet. That is, the next 10 feet will cost $125; the next 10 feet will cost $150, etc... and...

1 Pages(250 words)Essay

...= 150 and a standard error of
With α = .05, the critical region consists of sample means that corresponds to z-scores beyond the critical boundaries of z = ±1.96.
The appropriate distribution and the critical region is given by below figure
e. The test **statistic** is
f. The z-score obtained is not in the critical region. Therefore, the decision is to fail to reject H0. In conclusion, the data do not provide sufficient evidence that the new study-skills training program for elementary school children is effective.
10. a. The null and alternate hypotheses are
The distribution of sample means will be normal with an expected value of μ = 70 and a standard error of
With α = .05, the critical region consists of sample...

7 Pages(1750 words)Speech or Presentation

...Ethical **problems** in **statistics** Affiliation **Statistics** plays a significant part of our civic and democratic life. Therefore, the content ought to be developed by people who have achieved appropriate training in the discipline. This will ensure that the information reaching the intended users is precise in its judgments and truthful to them. Often this is not the case, and statisticians lie with **statistics**. Lies and misrepresentation in **statistics** can results due to the incompetence of statisticians although this is hardly the true in a majority of cases. Distortion of **statistical** data and handling for a particular purpose that can be...

2 Pages(500 words)Essay