Question

In: Statistics and Probability

Toothpaste The table shows the costs per ounce (in dollars) for a sample of toothpastes exhibiting...

Toothpaste The table shows the costs per ounce (in dollars) for a sample of toothpastes exhibiting very good stain removal, good stain removal, and fair stain removal. At α = 0.05, can you conclude that at least one mean cost per ounce is different from the others?

Very Good

.47

.49

.41

.37

.48

.51

Good

.60

.64

.58

.75

.46

Fair

.34

.46

.44

.60

Solutions

Expert Solution

Null Hypothesis, Ho:

There is no significant difference in the means cost per ounce for toothpaste exhibiting very good stain removal, good stain removal, and fair stain removal i.e.

  

Alternative Hypothesis, Ha:

There exists at least toothpaste for which the mean cost per ounce is significantly different i.e.    for at least one

Test Statistics: Under Ho,

where k = number of groups = 3 and,

n = number of observations = 15

Calculations:

Treatment Groups ni si
Very Good 6 0.455 0.0536
Good 5 0.606 0.1048
Fair 4 0.46 0.1071

So,

and ,

Decision:

Since, p-value = 0.02951 < , so we reject the Null Hypothesis at 5% level of significance.

Conclusion:

There exists at least toothpaste for which the mean cost per ounce is significantly different i.e.       for at least one


Related Solutions

12. Toothpaste The table shows the costs per ounce (in dollars) for a sample of toothpastes...
12. Toothpaste The table shows the costs per ounce (in dollars) for a sample of toothpastes exhibiting very good stain removal, good stain removal, and fair stain removal. At α = 0.05, can you conclude that at least one mean cost per ounce is different from the others? Using SPSS!!! Very Good .47 .49 .41 .37 .48 .51 Good .60 .64 .58 .75 .46 Fair .34 .46 .44 .60
The table to the right shows the cost per ounce​ (in dollars) for a random sample...
The table to the right shows the cost per ounce​ (in dollars) for a random sample of toothpastes exhibiting very good stain​ removal, good stain​ removal, and fair stain removal. At alpha=0.05​, can you conclude that the mean costs per ounce are​ different? Perform a​ one-way ANOVA test by completing parts a through d. Assume that each sample is drawn from a normal​ population, that the samples are independent of each​ other, and that the populations have the same variances....
The table below shows that costs per mile (in cents) for a sample of automobiles. Small...
The table below shows that costs per mile (in cents) for a sample of automobiles. Small sedan Medium sedan Large sedan SUV 4WD Minivan 43 67 64 87 66 41 49 73 66 76 49 63 83 75 59 54 59 75 78 51 46 64 80 70 52 72 Use the one-way ANOVA test in Excel to complete the following table (round decimals to three decimal places) ANOVA Source of Variation SS df MS F P-value F crit Between...
The table shows the prices (in dollars) for a sample of automobile batteries. The prices are...
The table shows the prices (in dollars) for a sample of automobile batteries. The prices are classified according to battery type. At α = .05α = .05α = .05, is there enough evidence to conclude that at least one mean battery price is different from the others? (Assume the samples are random and independent, the populations are normally distributed, and the population variances are equal) Battery Type A 110 100 125 90 120 Battery Type B 280 145 180 175...
The accompanying table shows the annual​ salaries, in thousands of​ dollars, earned by a sample of...
The accompanying table shows the annual​ salaries, in thousands of​ dollars, earned by a sample of individuals who graduated with MBAs in the years 2012 and 2013. Perform a hypothesis test using α equals= 0.05 to determine if the median salary for 2012 MBA graduates is lower than 2013 MBA graduates. Salaries​ (in thousands of​ dollars) for 2012 MBA graduates 92.6 66.1 60.6 85.5 92.8 44.7 84.4 81.1 44.2 94.3 66.6 61.6 94.6 81.6 Salaries​ (in thousands of​ dollars) for...
The spot price of silver is $20 per ounce. The storage costs are $0.30 per ounce...
The spot price of silver is $20 per ounce. The storage costs are $0.30 per ounce per year payable quarterly in advance. Assuming that interest rates are 4% per annum for all maturities, calculate the futures price of silver for delivery in 12 months.
The spot price of silver is $15.25 per ounce. The storage costs are $0.32 per ounce...
The spot price of silver is $15.25 per ounce. The storage costs are $0.32 per ounce per year payable quarterly in advance. Assuming that interest rates are 8.5% per annum for all maturities with continuous compounding, calculate the futures price of silver for delivery in nine months
The accompanying table shows raw data of fifteen adult sample. where income is in dollars. enter...
The accompanying table shows raw data of fifteen adult sample. where income is in dollars. enter the data into Excel and solve the problems using the multiple regression procedures . annual income age years of education years of work ID Y(1000s) X1 X2 X3 1 21 24 12 3 2 28 33 14 5 3 34 40 14 7 4 46 47 18 15 5 33 39 10 12 6 49 38 16 10 7 19 20 11 2 8...
7-2) The following table shows the bail bond (in US dollars) a sample of arrested men...
7-2) The following table shows the bail bond (in US dollars) a sample of arrested men and women had to pay to get out of jail. men women 1000 500 300 250 1500 250 200 200 500 500 150 250 1000 100 500 150 1200 250 Formulate the null hypothesis stating no gender difference in the bail bond the arrestees have to pay Formulate the alternative hypothesis Using the independent-sample t test, test the null hypothesis [H0] List the value...
Using SPSS!!! ONY SPSS 13. The table shows the costs per mile (in cents) for a...
Using SPSS!!! ONY SPSS 13. The table shows the costs per mile (in cents) for a sample of automobiles. At α = 0.01, can you conclude that at least one mean cost per mile is different from the others? Small Sedan Medium Sedan Large Sedan SUV 4WD Minivan 41 65 60 79 64 39 47 69 58 74 47 61 79 67 57 52 57 71 70 49 44 62 76 68 50 68
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT