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Question: A food research laboratory conducts a series of taste tests to compare two sauce recipes, A and B. Customers are presented with the sauces in random order. Of the 125 customers who tried sauce A first, 74 expressed a preference for sauce A. Of the 132 customers who tried sauce B first, 52 expressed a preference for sauce A.
(a) Looking at the data in total, calculate a 95% confidence interval for the overall proportion of customers who prefer sauce A. Does this confidence interval contain 0.5? What conclusion could you draw from this.
(b) Test the hypothesis that the proportion of customers who prefer sauce A is the same for those who try sauce A first, as for those who try sauce B first. State your null and alternative hypotheses clearly, your test statistic, p-value, and conclusion.
Construct a 95% confidence interval for the difference in the proportions of women and men who have regular exercise programs.
Add titles and modify the default colors, fonts, etc., as you judge appropriate to make the scatter plot effective. (b) Describe the relationship (if any) between X and Y. Weak? Strong? Negative? Positive? Linear? Nonlinear?
Describe a hypothesis related to the area of psychology in which you are predicting an interaction. Describe the specific nature of the interaction and why you think an interaction would occur.
With3 discrete variables(50 states, urban, and rural) and2 continuous variables(average time, 5 types of transportation). I need themean, median, mode, standard deviation.
Would you recommend test- ing H0 : m = 5 versus Ha : m> 5 or H0 : m= 5 versus Ha : m
An insurance company sells $300 deductible annual automobile insurance policies to a certain category (age, driving records) for $1000.00 The insurance company has set four different accident types
We have no idea Regarding the shape of the population distribution. What is the probability that the mean fee for a sample of 30 customers was less than $125?
In order to do so, they review 42 service calls and construct a 95% confidence interval for population mean: (2.468, 2.743). What can we conclude about the significance test of Ho: mu = 2.6 vs Ha: mu does not equal 2.6?
X has a normal distribution with a mean of 80.0 and a standard deviation of 3.5. Find the following probabilities:
Discuss an example from every day life, your professional experience, personal life or sports where two variables are positively correlated and why; discuss a second example where two variables are negatively correlated and why.
A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $2.78.
Use Friedman test to find out whether there is evidence for significant difference between two population variance. Use .05 level of significance.
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