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A 20-minute consumer survey mailed to 500 adults aged 25–34 included a $5 Starbucks gift certificate.
The same survey was mailed to 500 adults aged 25–34 without the gift certificate. There were 65 responses from the first group and 45 from the second group. (a) Perform a two-tailed test comparing the response rates (proportions) at α = .05. (b) Form a confidence interval for the difference of proportions, without pooling the samples. Does it include zero?
Please provide how you figured out the results.
Assume that sigma = 60, choose an alpha level, and perform a hypothesis test to determine whether this is good evidence to conclude that the mean score for all young men is less than 275.
Simplify the principal square root of 64 z^4. Assume that z represents a positive real number.
A professor asked her sophomore students, "How many drinks do you typically have per session? (A drink is defined as one 12oz beer, one 4oz glass of wine, or one 1oz shot of liquor.)"
Is this statistically significant evidence that the true mean diameter is greater than 20 millimeters? Set up the hypothesis, and enter your P-value below, rounded to four decimal places.
A marketing research firm wishes to estimate the proportion of adults who are planning to buy a new car in the next 6 months. A simple random sample of 100 adults led to 22 who were planning to buy a new car in the next 6 months.
A recent national survey found that high school students watched an average (mean) of 6.8 videos per month. A random sample of 36 college students revealed that the mean number of videos watched last month was 6.2
ExxonMobil's required return for equity, re is 14%. Its required return for debt, rd is 8%, its debt-to-total-value ratio L, is 35%, and its marginal tax rate, T is 40%, calculate its (adjusted WACC)?
At.05 significance level, is there a difference in mean number of calls per day between 2 employees? Compute the p -value?
Assume that a sample is drawn and z(α/2) = 1.65 and σ = 35. Answer the following questions. (A) If the Maximum Error of Estimate is 0.04 for this sample, what would be the sample size?
What is the probability that exactly 3 tomatoes in a randomly selected tray of 20 tomatoes will be too ripe. In each tray of 20 tomatoes, how many would be expected to be too ripe?
A Geiger-Muller tube and a scaler record approximately 50 counts per second due to a radioactive source. What is the shortest counting time required so that the percentage error of the counts will not exceed 1%?
Find the P-value that would be used to determine if the percentage of customers who prefer mint chocolate chip ice has increased at a 5% level of significance.
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