3. A random sample of 1000 students was selected from among the senior high school students across the Philippines. The average number of hours per day a typical student spends taking meals was found to be 2 h. Suppose the standard deviation of the population is actually S = 1.5 h. a. Construct the appropriate confidence intervals for the true mean number of hours per day a typical student spends taking meals. Summarize your answers in the table below. (1 – a) * 100% Confidence Interval for u Upper Limit Level of Confidence (1– a) * 100% Lower Limit 90% 95% 98% 99% b. Compare the confidence intervals obtained here with those in item 1. Discuss the effect of the population standard deviation on the length of the confidence intervals for the same level of confidence and fixed sample size. That is, what happens to the length of the confidence intervals when the population from which you are sampling becomes more dispersed?

Q: A sample of n = 6 scores has a mean of M = 10. If one score with a value of X = 12 is removed from…

A: Given that  A sample of n = 6 scores has a mean of M = 10

Q: Suppose that you want to determine the number of people who will attend a conference this year. In…

A: Given information: The investigator wants to determine the umber of people who will attend a…

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 16 for the population…

A:

Q: Using z scores, a population with u = 37 and o = 6 is standardized so that the new mean is u = 50…

A:

Q: Assume thAt scores on a standardized test are known to follow a bell shaped distribution with a mean…

A: L

Q: In a certain state, two-fifths of all adults register as Democrats.  A random sample of 150 adults…

A: From the information, given thatLet the random variable X denotes the number of registered Democrats…

Q: Let X = { 1,2,6,9,11}. Find the mean and standard deviation given that X is a sample. %3!

A: The mean for the sample is calculated as follows:

Q: A study found the temperature of 125 randomly selected healthy adults averaged 98.25 F with a…

A: It is given that sample mean is 98.25 and standard deviation is 0.733.

Q: A statistics professor announces that 15% of the grades he gives are As. The results of the final…

A: It is given that the mean and standard deviation are 83 and 6, respectively.

Q: During rush hour, the traffic speed on a busy highway is found to have mean 42 mph and standard…

A:

Q: The mean and standard deviation of the sampling distribution of the mean is shown as?

A:

Q: At a certain concert, 34 % of the audience was under 20 years old. A random sample of n = 249…

A: Given,sample size(n)=249sample proportion(p^)=0.34

Q: A population has a stand. dev. of 24. on average, how much difference should there be between the…

A:

Q: In a population, the mean is known to be 1.27 and the standard deviation is known to be 0.351.…

A: The population mean is 1.27; μ=1.27 The population standard deviation is 0.351;σ=0.351 The sample…

Q: A population of N= 23 scores has a mean of u = 5. After one score is removed, the mean is found to…

A: Given that - A population of N= 23 scores has a mean of u = 5. After one score is removed, the mean…

Q: The scores on an IQ test are normally distributed with a standard deviation of 14 and a mean of 100.…

A: Let X be the IQ score from normal distribution with mean (μ) = 100 and standard deviation (σ) = 14…

Q: Give the mean and the standard deviation of the distribution of means for mean=100; Variance=100;…

A:

Q: Assume that the heights of American men are normally distributed with a mean of 69.1 inches and a…

A: From the given information we find the solution

Q: What is the ∑X for this sample

A: A sample of size is denoted by n. mean is nothing but the average of given sample observations. Here…

Q: The scores of individual students on the ACT Exam are modeled as normally distributed with a mean of…

A:

Q: ith a mean of 110 and standard dev. of 15, find the 3 unique deviations to the left and right of the…

A: Deviations to the left   i) One standard deviation away from mean x = u - s x = 110 - 15 = 95   ii)…

Q: For a sample with a mean if M=63, a score of X=54 corresponds to Z= -0.75. what is the sample…

A: Given,Mean(M)=63a raw score(X)=54Z-score=-0.75

Q: In a large section of a statistics​ class, the points for the final exam are normally​ distributed,…

A: Finding the lowest score that would qualify a student for an A grade:The points for the final exam…

Q: A notable indicator of a baby's health is the weight gained in the first year of the baby's life.…

A: From given data we have ;   sample size =15 Point estimate  = 5.658 standard deviation =1.869   here…

Q: We have a distribution with a mean of ? = 35 and ? = 3.5. Find the raw score equivalents for the…

A:

Q: Determine the sample size required to estimate the mean score on a standardized test within 2 points…

A: Given,margin of error(E)=2standard deviation(s)=15α=1-0.98=0.02α2=0.01Z0.01=2.33      (from Z-table)