5-Step Hypothesis Testing
Please see attachment Perform a 5 step hypothesis of number of males and females 25 to 29 years of age with bachelor degrees. 1% tcrit. ( percentage expressed using decimals ) Year Subjects Males Females 2003 1 .50 .53 200
Student's t-Test
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Independent government agency
An independent government agency is interested in comparing the heating is interested in comparing the heating cost of all-electric home and those of home heated with natural gas. A sample of eight all-electric homes is matched with eight homes of similar size and other features that use natural gas. The heating costs for Ja
Probability - Independent - Related-Samples t-test
Bring to mind a real-world situation or problem that could be addressed using an independent- or related-samples t test. However, the real-world situation or problem selected to address, the independent and dependent variables you would study, an explanation of whether an independent-samples or related-samples t test is most ap
T-test for SAT Preparatory Program
A random sample of 36 seniors in high school shows that the difference in aptitude scores after taking an SAT-preparatory program is 700 points. Also, the sum of the squared differences is known to be 66,800. Determine whether this difference is significant at the 1% level of risk. Use the t test to decide whether the program
R-square, T-test, and signs of each X variables
Use Microsoft Excel to run a regression analysis.
Hypothesis Testing
An Ohio university wishes to demonstrate that car ownership is detrimental to academic achievement. A random sample of 100 students who do not own cars had a mean GPA of 2.68 with a standard deviation of 0.6, while the same size of sample who own cars had a mean GPA of 2.55 with a standard deviation of 0.7. Can the university
Several factors influence the value obtained for a t statistic. Some factors affect the numerator of the t statistic and others influence the size of estimated standard error in the denominator. For each of the following. indicate whether the factor influences the numerator or denominator of the t statistic and determine whether the effect would be to increase the value of t ( farther from zero) or decrease the value of t ( closer to zero) In each case, assume that all other factors remain the constant. a. Increase the variability of the scores. b. Increase number of scores in the sample. c. Increase the difference between the sample mean and the population mean.
Several factors influence the value obtained for a t statistic. Some factors affect the numerator of the t statistic and others influence the size of estimated standard error in the denominator. For each of the following. indicate whether the factor influences the numerator or denominator of the t statistic and determine whethe
T-statistic computation - What is the value of the difference between the two means? What is the value of the standard error of the mean difference? ...
Experimental Control Pair A 8 5 Pair B 4 1 Pair C 3 4 Pair D 8 5 Pair E 9 5 Pair F 9 6 What is the value of the difference
Independent sample t test population
Please see the attached file. Problem 8-55 Two movies were screen-tested at two different samples of theaters. Mystic river was viewed at 80 theaters and was considered a success in terms of box office sales in 60 of these theaters. Swimming Pool was viewed at a random sample of 100 theaters and was considered a success
The solution to One sample t test
Fishing Trout. Pyramid Lake is on the Paiute Indian Reservation in the Nevada. The lake is famous for cutthroat trout. Suppose a friend tells you that the average length of trout caught in Pyramid lake is = 19 inches. However the creel survey reported that for a random sample of 51 fish caught, the mean length was xbar = 18.5
Statistics - Random Variables
Glucose level: Horses Gentle Ben is a Morgan horse at a Colorado dude ranch. Over the past 8 weeks, a veterinarian took the following glucose readings from this horse (in mg/100 ml.) 93 88 82 105 99 110 84 89 The sample mean xbar 93.8. Let x be a random variable representing glucose readings readings taken from Gentle Ben.
Testing of hypothesis under traditional and p value approach.
9.54 Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard
Step by step method for testing the hypothesis under 5 step approach is discussed here.
A manufacturer has taken a sample of 25 packages from a production line, the standard deviation of the sample weight is 2.1 pounds, and the mean weight of this sample is 33.7 pounds. If the desired product weight is 30 pounds, for a significance level of 0.05, are you putting too much weight into these packages? State the null a
Hypothesis Testing Problems: T-test
A sample of 64 observations is selected from a normal population. The sample mean is 215, and the sample standard deviation is 15. Conduct the following test of hypothesis using the .03 significance level. H0: µ ≥ 220 H1: µ < 220 (a) Is this a one- or two-tailed test? (b) What is the decision rule? (c) What is
T-Test for Dependent or Independent Means
20 students picked randomly for an experimental group to receive instructional program. 30 students chosen as control group do not receive instructional program. Experimental group mean is 38 with a standard deviation of 3. The control group has a mean of 35 with an estimated population standard deviation of 5. Using .05 lev
This question is designed to assess the similarities and differences between a Z-score and a t-test.
Under what circumstances would you conduct a z-test? When would you preform a t-test?
Critical Value: t -test for the correlation coefficient
A correlation coefficient computed for n=18 and a=0.10 is r=0.692. . Using the t -test for the correlation coefficient, what are the critical values? A) +1.734 B) +2.120 C) +1.746 D) +2.101
Independent sample t test..
The average mpg usage for a 2004 Ford Expedition 2WD for a sample of 10 tanks of gas was 17.0 with the standard deviation of 0.8. For a Ford Explorer 2WD, the average mpg usage for a sample of 10 tanks of gas was 18.5 with a standard deviation of 1.0. (a) Assuming equal variances, at a (alpha) = .01. is the true mean mpg lower
Z and T Test
a. Select a variable. Compare the mean of the variable for a sample of 30 for one group with the mean of the variable for a sample of 30 for a second group. Use a z test. b. Select a variable. Compare the mean of the variable for a sample of 10 for one group with the mean of the variable for a sample of 10 for a second group
Statistics problem - t Test with unequal variances
Mauricio Cruz, a wine merchant for Cruz's Spirits Emporium, wants to determine if the average price of imported wine is less than the average price of domestic wine. The data obtained is shown in the table below. Imported Wine Domestic Wine 7.03 9.78 2.31 3.62 15 16 Wh
Important information about t-statistic
Nationwide, the average waiting time until electric utility customer service representative answers a call is 300 seconds per call. The Gigantic Kilowatt Energy Company took a sample of 35 calls and found that, on the average, they answered in 240 seconds per call with a standard deviation of 50. Can the company claim that the
Paired T test for blood pressure data
D. The Sunbeam Corporation makes a wide variety of appliances for the home. One product is a digital blood pressure gauge. For obvious reasons, the blood pressure readings made by the monitor need to be accurate. When a new model is being designed, one of the steps is to test it. To do this, a sample of people is selected.
The president of the American Insurance Institute wants to compare the yearly costs of auto insurance using paired test.
The president of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies. He selects a sample of 15 families, some with only a single insured driver, others with several teenage drivers, and pays each family a stipend to contact the two companies and ask for a price q
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead.
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard devi
Tests of Means and Proportions: Repair Time
A digital camcorder repair service has set a goal not to exceed an average of 5 working days from the time the unit is brought in to the time repairs are completed. A random sample of 12 repair records showed the following repair times (in days): 9, 2, 5, 1, 5, 4, 7, 5, 11, 3, 7, 2. At α = .05 is the goal being met?
Difference Between t statistic and z statistic
I am having trouble understanding this multiple choice question. The reason the t statistic has more variability than the z statistics is that from sample to sample a. the sample mean becomes smaller and the sample variance becomes larger b. the sample mean becomes larger and the sample variance becomes smaller c. neithe
Color-Distance Illusion Analysis
Having trouble entering data it is ok to use excel. SPSS t-Tests (Independent Samples and Paired Samples) Scenario: The color-distance illusion (Kantowitz, Roediger, & Elmes, 1997) suggests that in art, warm colors (yellow, orange, red, and blends of these colors) appear to move toward the viewer when viewed from a
T Test for Two Variables- Sleeping Problems and Gender
I have provided the info I need in the attachment.
Hypothesis Testing: Using a T-Test
I have a sample of 40 surveys selected from one population and the mean is 102 and the sample deviation is 5. If 50 surveys are selected from a second source, the mean is 99 with a standard deviation of 6. Conduct a hypothesis test using the .04 significance level to see if their is a difference between the population means.
Wall Street Journal reported 30-year mortgage rate
A recent article in the Wall Street Journal reported that the 30-year mortgage rate is now less than 6 percent. A sample of eight small banks in the Midwest revealed the following 30-year rates (in percent): 4.8 5.3 6.5 4.8 6.1 5.8 6.2 5.6 At the .01 significance level, can we conclude that the 30-year mortgage rate for sm