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# 6- Some researchers are doing a two-mean pooledFor sample 1 : s1=5.1 and x1…

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6- Some researchers are doing a two-mean pooledFor sample 1 : s1=5.1 and x1 =60What are the test statistic t-test. They have two samples with sizes n1=15 and n2=20. The population standard deviations are unknown but assumed to be equal, so the sample standard deviations are found and used to calculate a pooled standard deviation, sp.For sample 2 : s2=4.3 and x2=64 (t) and the degrees of freedom to perform this test?
Cigarette Smoking A researcher found that a cigarette smoker smokes on average 30 cigarettes a day. She feels that this
Cigarette Smoking A researcher found that a cigarette smoker smokes on average 30 cigarettes a day. She feels that this average is too low. She selected a random sample of 11 smokers and found that the mean number of cigarettes they smoked per day was 31. The sample standard deviation was 2.5. At α=0.05, is there enough evidence to support her claim? Assume that the population is approximately normally distributed. Use the critical value method and tables. (c)Compute the test value. Always round t score values to three decimal places.
A person’s blood glucose level and diabetes are closely related. Let xxμσNote: be a random variable measured in milligrams of
A person’s blood glucose level and diabetes are closely related. Let xxμσNote: be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. Suppose that after a 12-hour fast, the random variable will have a distribution that is approximately normal with mean = 83 and standard deviation = 30. After 50 years of age, both the mean and standard deviation tend to increase. For an adult (under 50) after a 12-hour fast, find the following probabilities. (Round your answers to four decimal places.)(a) x is more than 60 :__________(b) x is greater than 16 :________(c) x is between 16 and 60 :________(d) x is more than 60 (This may indicate an infection, anemia, or another type of illness.) :________
The following frequency distribution presents the number of text messages received via cell phone by 50 high school students.Number of
The following frequency distribution presents the number of text messages received via cell phone by 50 high school students.Number of text messages received Frequency0-59 860-119 1120-179 7180-239 16240-299 6a) How many classes are in the frequency distribution? b) What is the class width of each class? c) Construct a frequency histogram.
Why does it matter that there is homogeneity of variance when you want to use the independent-samples t -test?What are
Religion and Theology Assignment Writing ServiceWhy does it matter that there is homogeneity of variance when you want to use the independent-samples t -test?What are degrees of freedom used for?If the direction of the difference between two groups is not specified, will you want to use a one-tailed or a two-tailed test?When is an independent-samples t-test used?What are assumptions, and why are they important?What does it mean when you find a statistically significant difference?
An automobile manufacturer stated that it will be willing to mass produce electric-powered cars if more than 30% of potential
An automobile manufacturer stated that it will be willing to mass produce electric-powered cars if more than 30% of potential buyers indicate they will purchase the newly designed electric cars. In a sample of 500 potential buyers, 160 indicated that they would buy such a product. a. State the hypotheses for this problem. List the Type I and Type II error. b. Compute the standard error of Population Proportion. c. Compute the test statistic. d. At the 5% level of significance, what is your conclusion? Should the manufacturer produce the new electric-powered car? Why?
Give me a step by step answer for the following homework: The average return for large-cap domestic stock funds over
Give me a step by step answer for the following homework: The average return for large-cap domestic stock funds over the three years 2009-2011 was 14.4% (AAII Journal, February, 2012). Assume the three-year returns were normally distributed across funds with a standard deviation of 4.4%. a. What is the probability an individual large-cap domestic stock fund had a three-year return of at least 20%? b. What is the probability an individual large-cap domestic stock fund had a three-year return of 10% or less? c. How big does the return have to be to put a domestic stock fund in the top 10% for the three-year period?
An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between
An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between 130 lb and 171 lb. The new population of pilots has normally distributed weights with a mean of 136 lb and a standard deviation of 31.3 lb.a. If a pilot is randomly​ selected, find the probability that his weight is between 130 lb and 171 lb.The probability is approximately nothing. ​(Round to four decimal places as​ needed.)b. If 30 different pilots are randomly​ selected, find the probability that their mean weight is between 130 lb and 171 lb.The probability is approximately nothing. ​(Round to four decimal places as​ needed.)c. When redesigning the ejection​ seat, which probability is more​ relevant?
1 Year Amount 1R150 0002R135 0003R210 0004R120 0005R 90 000 ​The Bloom
1 Year Amount 1R150 0002R135 0003R210 0004R120 0005R 90 000 ​The Bloom