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A credit score is used by credit agencies? (such as mortgage companies and? banks) to assess the creditworthiness of individuals. Values range from 300 to? 850, with a credit score over 700 considered to be a quality credit risk. According to a? survey, the mean credit score is 706.9. A credit analyst wondered whether? high-income individuals? (incomes in excess of? $100,000 per? year) had higher credit scores. He obtained a random sample of 32 ?high-income individuals and found the sample mean credit score to be 721.7 with a standard deviation of 84.9. Conduct the appropriate test to determine if? high-income individuals have higher credit scores at the α = 0.05 level of significance.
State the null and alternative hypotheses.
H0?: μ = 706.9
H1?: μ > 706.9
(Type integers or decimals. Do not? round.)
Identify the? t-statistic.
t0 = 0.99
(Round to two decimal places as? needed.)
Identify the? P-value.
?P-value = _______
?(Round to three decimal places as? needed.)
A simple random sample with n=52 provided a sample mean of 22.0 and a sample standard deviation of 4.3.
What is the probability that the worst will occur and she will have surprise quizzes in all three classes? What is the probability that she will escape with minimal damage and have a quiz in only one of the three classes?
Types of digital cameras are equal, is there evidence of a difference in the mean battery life between the two types of digital cameras at the 95% confidence level?
Test an appropriate hypothesis and state your conclusion.- If your conclusion is incorrect, which type of error did you commit?
The Community College's budget is subject to the approval of the County Executive and the County Legislature, with the County providing substantial funding
EXTRA CREDIT-Construct a 95% confidence interval for the total expenditure on aluminum at the Akron plant.
Translate the following statements into symbolic form using capital letters to represent affirmative English statements.- Either Rado does not make a sapphire watch or if Movado makes one then so does Pulsar.
Choosing items which correlate highly with an external criterion maximizes the test's:
a trucking firm delivers appliances for a large retail operation. the packages or crates have a mean weight of 294 lb.
A statistics instructor believes that 50% of his students are male. One of his students thinks there are more males than females taking statistics so he decides to conduct a random survey of past courses. He found that 83 of 150 students were ma..
the p-value for a one-mean t-test is estimated using a t-table as 0.05 lt p lt 0.10. based on this information for what
You are required to make presentation to all staff on how energy wastage can be reduced. This presentation should include the following.
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