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In a random sample of 23 fifth graders, the mean weight is 62.8 pounds and the...
A random sample of 45 adult elephants had the sample mean weight of 12,240 pounds and the sample standard deviation of 450 pounds. A random sample of 80 adult hippos had the sample mean weight of 5,700 pounds and the sample standard deviation of 400 pounds. Assume that the two populations are approximately normally distributed. A zoologist claims that the difference between the overall weights of adult elephants and adult hippos is 6,300 pounds, however others believe the difference must...
2. Birth weights are normally distributed with a mean of 7.6 pounds and a standard deviation of 1.23 pounds. What is the probability that a newborn weighs more than 11.3 pounds? Ans 2 3. X is binomial with n = 700 and p = .32. Use the standard normal distribution to approximate P(207 < X < 256). Ans 3 4. A population has a known variance of 22.9. If you draw random samples of size 24 and construct the sampling...
The mean weight gain during pregnancy is 30 pounds with a standard deviation of 12.9 pounds. If an obstetrician obtains a random sample of 35 patients, what is the probability that the mean weight gain during pregnancy from that sample is at least 34.5 pounds? That is, with n = 35, what is P(x≥34.5)?
the mean weight of all 20 year old women is 128 pounds. a random sample of 40 vegetarian 20 year old women resulted in a sample mean of 122 pounds and standard deviation of 15 pounds. do vegetarian 20 year old women weigh significantly less than 20 year women in general? a). set up hypothesis for test b.)calculate 99% confidence interval for population mean weight of all 20 year old vegetarian women. what test could you use to solve this...
In a random sample of 64 trout, the average weight is 3 pounds, with standard deviation s = .5 pounds Find: sample mean standard error of the sample mean margin of error 95% 95% confidence interval for the population mean, µ:
a random sample of 25 people whose population average weight is 160 pounds with a standard deviation of 20 pounds would have a standard deviation of the sample mean equal to ? What is the mean of the sampling distribution referred to in question 4?
The weight of bags of organic fertilizer is normally distributed with a mean of 50 pounds and a standard deviation of 1 pound. If we take a random sample of 25 bags of organic fertilizer, there is an 80% chance that their mean weight will be greater than what value? Keep 4 decimal places in intermediate calculations and report your final answer to 2 decimal places. Your Answer: Answer Question 9 (1 point) Weights of gumballs follow a normal distribution...
The mean weight of all 20-year-old women is 128 pounds. A random sample of 40 vegetarian women ho are 20 years old showed a sample mean of 122 pounds with a standard deviation of 15 pounds. women's measurements were independent of each other. Determine whether the mean weight tor 20 year-old vegetarian women is significantly less than 128, using a significant level of 0.05 The (a) (4 points) State the null and alternative hypotheses using both symbols and words (be...
The following data give the weight lost (in pounds) by a sample of the five members of a health club at the end of two months of membership: 3 6 5 10 8 a) the sample mean b) the sample standard deviation
Question 23 (1 point) A hospital researcher wishes to estimate the mean weight of full-term newborns. A random sample of 13 full-term newborns had a mean birth weight of 7.3 pounds with a standard deviation of 2.2 pounds. Compute a 95% confidence interval for the mean weight of all full-term newborns.