Question

The mean weight of males aged over 30 years in a certain population is 76 KG....

The mean weight of males aged over 30 years in a certain population is 76 KG. Recently there was some tendency among this population to practice exercises to reduce weight. A random sample of size 40 is selected and it is found that sample mean and standard deviation are 74 and 8 respectively. Do the data provide sufficient evidence to conclude that the mean weight for this population has reduced. Use 5% significance level.

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Claim that for the population of statistic: The mean score is 74, using alternative hypothesis that...
Claim that for the population of statistic: The mean score is 74, using alternative hypothesis that the mean score is different from 74. Sample statistics include n=21,, x=76,x¯=76, and s=11. Use a significance level of α=0.05. Test Statistic: Positive Critical Value: Negative Critical Value: Conclusion: A. There is not sufficient evidence to reject the claim that the mean score is equal to 74 or B. There is sufficient evidence to reject the claim that the mean score is equal to...
Children of a certain age are known to have a mean weight of 85 pounds. A...
Children of a certain age are known to have a mean weight of 85 pounds. A complaint is made that the children living in a municipal home are overfed. As one bit of evidence, 25 randomly selected children are weighed and found to have a mean weight of 87 pounds. It is known that the population standard deviation is 11.6 pounds. Is there convincing evidence at 0.05 significance level that mean weight of the children is greater than 85 pounds?...
An agronomist wanted to estimate the mean weight of a certain fruit (?) in his farm....
An agronomist wanted to estimate the mean weight of a certain fruit (?) in his farm. He selected a random sample of size ?=16, and found that the sample mean ?̅=55 gm and a sample stranded deviation ?= 3 gm. It is assumed that the population is normal with unknown standard deviation (?). a) Find a point estimate for (?). b) Find a 95% confidence interval for the population mean (?).
The weight (in pounds) for a population of school-aged children is normally distributed with a mean...
The weight (in pounds) for a population of school-aged children is normally distributed with a mean equal to 123 ± 25 pounds (μ ± σ). Suppose we select a sample of 100 children (n = 100) to test whether children in this population are gaining weight at a 0.05 level of significance. 1. What are the null and alternative hypotheses? 2. What is the critical value for this test? 3. What is the mean of the sampling distribution? 4. What...
Suppose the mean height of women age 20 years or older in a certain country is...
Suppose the mean height of women age 20 years or older in a certain country is 62.9 inches. One hundred randomly selected women in a certain city had a mean height of 63.8 inches. At the 5% significance level, do the data provide sufficient evidence to conclude that the mean height of women in the city differs from the national mean? Assume that the population standard deviation of the heights of women in the city is 3.9 inches. The standard...
A simple random sample of 16 adults drawn from a certain population of adults yielded a...
A simple random sample of 16 adults drawn from a certain population of adults yielded a mean weight of 63kg. Assume that weights in the population are approximately normally distributed with a variance of 49. Do the sample data provide sufficient evidence for us to conclude that the mean weight for the population is less than 70 kg? Let the probability of committing a type I error be .01. 1. Write the hypotheses, indicate the claim 2. find the critical...
A simple random sample of 16 adults drawn from a certain population of adults yielded a...
A simple random sample of 16 adults drawn from a certain population of adults yielded a mean weight of 63kg. Assume that weights in the population are approximately normally distributed with a variance of 49. Do the sample data provide sufficient evidence for us to conclude that the mean weight for the population is less than 70 kg? Let the probability of committing a type I error be .01. 1. Write the hypotheses, indicate the claim 2. find the critical...
A supermarket wants to estimate the population mean weight of watermelons of a certain type. A...
A supermarket wants to estimate the population mean weight of watermelons of a certain type. A sample size n = 45 has sample mean = 20 pounds with sample standard deviation s = 2.2 pounds. Create a confidence interval at 90% confidence for the population mean μ.
The weight (in pounds) for a population of school-aged children is normally distributed with a mean...
The weight (in pounds) for a population of school-aged children is normally distributed with a mean equal to 132 ± 24 pounds (μ ± σ). Suppose we select a sample of 100 children (n = 100) to test whether children in this population are gaining weight at a 0.05 level of significance. A. What are the null and alternative hypotheses? H0: μ = 132 H1: μ ≠ 132H0: μ = 132 H1: μ < 132    H0: μ ≤ 132 H1: μ...
Question 2 (1 point) Suppose that the mean cholesterol level for males aged 50 is 241....
Question 2 (1 point) Suppose that the mean cholesterol level for males aged 50 is 241. An investigator wishes to examine whether cholesterol levels are significantly reduced by modifying diet only slightly. A sample of 12 patients agrees to participate in the study and follow the modified diet for 3 months. After 3 months, their cholesterol levels are measured and the summary statistics are produced on the n = 12 subjects. The mean cholesterol level in the sample is 235...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT