An experiment was planned to compare the mean time (in days) required to recover from a...
An experiment was planned to compare the mean time (in days) required to recover from a common cold for persons given a daily dose of 4 milligrams (mg) of vitamin C, μ2, versus those who were not given a vitamin supplement, μ1. Suppose that 31 adults were randomly selected for each treatment category and that the mean recovery times and standard deviations for the two groups were as follows.
|
No Vitamin Supplement |
4 mg Vitamin C |
|
|---|---|---|
| Sample Size | 31 | 31 |
| Sample Mean | 6.7 | 5.3 |
| Sample Standard Deviation |
2.6 |
1.7 |
Conduct the statistical test of the null hypothesis in part (a) and state your conclusion. Test using α = 0.05. (Round your answers to two decimal places.)
z = _____
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An experiment was planned to compare the mean time (in days)
required to recover from a...
An experiment was planned to compare the mean time (in days) required to recover from a...
An experiment was planned to compare the mean time (in days) required to recover from a common cold for persons given a daily dose of 4 mg of vitamin C, μ2, versus those who were not given a vitamin supplement, μ1. Suppose that 34 adults were randomly selected for each treatment category and that the mean recovery times and standard deviations for the two groups were as follows. No Vitamin Supplement 4 mg Vitamin C Sample size 34 34...
An experiment was planned to compare the mean time (in days) required to recover from a...
An experiment was planned to compare the mean time (in days) required to recover from a common cold for persons given a daily dose of 4 milligrams (mg) of vitamin C, 142, versus those who were not, H. Suppose that 32 adults were randomly selected for each treatment category and that the mean recovery times and standard deviations for the two groups were as follows. No Vitamin Supplement 32 Sample Size Sample Mean Sample Standard Deviation 4 mg Vitamin C...
5. A company wanted to show, that their vitamin supplement decreases the recovery time from a...
5. A company wanted to show, that their vitamin supplement decreases the recovery time from a common cold. They selected randomly 70 adults with a cold. 35 of those were randomly selected to receive the vitamin supplement. The other group received a placebo. The data on the recovery time for both samples is shown below. Drug Sample size Sample mean Sample standard deviation Placebo 35 6.9 2.9 vitamin 35 5.8 1.2 Table 3 Answer the questions below: (a) Assume the...
1. When hybrid vehicles were introduced the mean time required for savings from increased fuel economy...
1. When hybrid vehicles were introduced the mean time required for savings from increased fuel economy to recover the additional initial cost was 4.2 years. To test whether it is now less an economist performed a study of 12 hybrid vehicles. The mean time cost recovery time was 3.9 years with sample standard deviation 0.6 years. The test is performed at the 1% level of significance. Assume that the population of recovery times is normally distributed. a) State the null...
A study was designed to compare the attitudes of two groups of nursing students towards computers....
A study was designed to compare the attitudes of two groups of nursing students towards computers. Group 1 had previously taken a statistical methods course that involved significant computer interaction. Group 2 had taken a statistic methods course that did not use computers. The students' attitudes were measured by administering the Computer Anxiety Rating Scale (CARS). A random sample of 15 nursing students from Group 1 resulted in a mean score of 66.5 with a standard deviation of 2.6. A...
In an investigation of pregnancy-induced hypertension, one group of women with this disorder was treated with...
In an investigation of pregnancy-induced hypertension, one group of women with this disorder was treated with low-dose aspirin, and a second group was given a placebo. A sample consisting of 23 women who received aspirin has mean arterial blood pressure 111 mm Hg and standard deviation 8 mm Hg; a sample of 24 women who were given the placebo has mean blood pressure 109mm Hg and standard deviation 8 mm Hg. Suppose that the required assumptions to make inference for...
Question 1. The time taken for bleeding from a pricked finger to stop has a mean...
Question 1. The time taken for bleeding from a pricked finger to stop has a mean of 1.5 mins. To see whether pressure applied to the upper arm increases the time taken for bleeding to stop, a sample of 18 persons was taken. All the 18 persons had identical slight pressure applied to their upper arms and their fingers were pricked. The observed mean time taken for bleeding to stop for the sample was 1.7 mins and the standard deviation...
In a paper the authors distinguish between spending money on experiences (such as travel) and spending...
In a paper the authors distinguish between spending money on experiences (such as travel) and spending money on material possessions (such as a car). In an experiment to determine if the type of purchase affects how happy people are with the purchase after it has been made, 185 college students were randomly assigned to one of two groups. The students in the "experiential" group were asked to recall a time when they spent about $300 on an experience, and then...
photos for each question are all in a row (1 point) In the following questions, use...
photos for each question are all in a row
(1 point) In the following questions, use the normal distribution to find a confidence interval for a difference in proportions pu - P2 given the relevant sample results. Give the best point estimate for p. - P2, the margin of error, and the confidence interval. Assume the results come from random samples. Give your answers to 4 decimal places. 300. Use 1. A 80% interval for pı - P2 given that...
A. B. 2. The test statistic,is ______ (Round to two decimal places as needed.) 3. The P-value is ______ (Round t...
A.
B.
2. The test statistic,is ______
(Round to two decimal places as needed.)
3. The P-value is ______
(Round to three decimal places as needed.)
4. State the conclusion for the test.
________________ the null hypothesis. There ______ sufficient
evidence to support the claim that those treated with magnets have
a greater mean reduction in pain than those given a sham
treatment.
5. Is it valid to argue that magnets might appear to be
effective if the sample sizes...
An experiment was planned to compare the mean time (in days) required to recover from a common cold for persons given a daily dose of 4 milligrams (mg) of vitamin C, 142, versus those who were not, H. Suppose that 32 adults were randomly selected for each treatment category and that the mean recovery times and standard deviations for the two groups were as follows. No Vitamin Supplement 32 Sample Size Sample Mean Sample Standard Deviation 4 mg Vitamin C...
5. A company wanted to show, that their vitamin supplement decreases the recovery time from a common cold. They selected randomly 70 adults with a cold. 35 of those were randomly selected to receive the vitamin supplement. The other group received a placebo. The data on the recovery time for both samples is shown below. Drug Sample size Sample mean Sample standard deviation Placebo 35 6.9 2.9 vitamin 35 5.8 1.2 Table 3 Answer the questions below: (a) Assume the...
1. When hybrid vehicles were introduced the mean time required for savings from increased fuel economy to recover the additional initial cost was 4.2 years. To test whether it is now less an economist performed a study of 12 hybrid vehicles. The mean time cost recovery time was 3.9 years with sample standard deviation 0.6 years. The test is performed at the 1% level of significance. Assume that the population of recovery times is normally distributed. a) State the null...
photos for each question are all in a row
(1 point) In the following questions, use the normal distribution to find a confidence interval for a difference in proportions pu - P2 given the relevant sample results. Give the best point estimate for p. - P2, the margin of error, and the confidence interval. Assume the results come from random samples. Give your answers to 4 decimal places. 300. Use 1. A 80% interval for pı - P2 given that...
A.
B.
2. The test statistic,is ______
(Round to two decimal places as needed.)
3. The P-value is ______
(Round to three decimal places as needed.)
4. State the conclusion for the test.
________________ the null hypothesis. There ______ sufficient
evidence to support the claim that those treated with magnets have
a greater mean reduction in pain than those given a sham
treatment.
5. Is it valid to argue that magnets might appear to be
effective if the sample sizes...
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