MATH 221 (MATH221)

MATH 221 Week 6 Lab

1. Question: A consumer analyst reports that the mean life of a certain type of alkaline battery is more than 63 months. Write the null and alternative hypotheses and note which is the claim. 2. Question: An amusement park claims that the average daily attendance is at least 20,000. Write the null and alternative hypotheses and note which is the claim. 3. Question: Type I and type II errors occur because of what issue within the hypothesis testing process? 4. Question: A scientist claims tha...

A random sample of 100 medical school applicants at a university has a mean total score of 502 on the MCAT. According to a report, the mean total score for the school’s applicants is more than 499. Assume the population standard deviation is 10.6. At α = 0.01, is there enough evidence to support the report’s claim? (Source: Association of American Medical Colleges)

Describing Residuals: Describe from the textbook as listed in graphics- what does it mean, if anything if residuals are small?

1. Question: Two variables have a negative non-linear correlation. Does the dependent variable increase or decrease as the independent variable increases? 2. Question: What does the variable r2 represent? 3. Question: A golfer wants to determine if the type of driver she uses each year can be used to predict the amount of improvement in her game. Which variable would be the response variable? 4. Question: What would be the notation for an estimate of y for a specific value of x? 5. Question:...

Complete the following by writing a response to threeof the four following questions. For each question, your response should be 2 or more paragraphs. Make it clear which question you are answering and use correct grammar throughout. If you answer all four questions, only the first three provided will be graded.

1. Question: (CO 4) From a random sample of 68 businesses, it is found that the mean time that employees spend on personal issues each week is 5.8 hours with a standard deviation of 0.35 hours. What is the 95% confidence interval for the amount of time spent on personal issues? 2. Question: (CO 4) If a confidence interval is given from 8.52 to 10.23 and the mean is known to be 9.375, what is the maximum error? 3. Question: (CO 4) Which of the following is most likely to lead to a small margin ...

1. Question: From a random sample of 58 businesses, it is found that the mean time the owner spends on administrative issues each week is 21.69 with a population standard deviation of 3.23. What is the 95% confidence interval for the amount of time spent on administrative issues? 2. Question: If a confidence interval is given from 43.83 up to 61.97 and the mean is known to be 52.90, what is the margin of error? 3. Question: If a computer manufacturer needed a supplier that could produce parts ...

Joseph and Kandy when we develop a confidence interval (CI) we are computing a rangeofvalues that’s likely to include a population value with a certain degree of confidence. It isan interval that tells us that the population means lies between an upper and lowerinterval.What are commonly used confidence intervals? (Responses to the questionabove)