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# A researcher is testing the effect of a new cold and flu medication on mental alertness. A sample of n = 9 college students

A researcher is testing the effect of a new cold and flu medication on mental alertness. A sample of n = 9 college students is obtained and each student is given the normal dose of the medicine. Thirty...

# A sample of n = 25 scores has a mean of M = 40 and a variance of s2 = 100. What is the estimated standard error for the sample mean?

What is the estimated standard error for the sample mean?

# If other factors are held constant, what is the effect of increasing the sample variance on t-test?

1. It will increase the estimated standard error and increase the likelihood of rejecting H0. 2. It will increase the estimated standard error and decrease the likelihood of rejecting...

# how do i find the answer

An IQ test has a mean of 100 and a standard deviation of 15. The test scores are normally distributed. Find the percentage of people who will score below 93. Give your answer as a percent rounded...

# how to solve the prob/

The average size (in square feet) of homes built in the United States in the fourth quarter of 2008 was 2,343. Assume the variable is normally distributed and the standard deviation is 152 square...

# One operations of a steel mill is to cut pieces of steel into parts that are used in the frame

One operations of a steel mill is to cut pieces of steel into parts that are used in the frame for front seats in an automobile.  The steel is cut with a diamond saw and requires the resulting...

# In a population of exam scores, a score of X = 85 corresponds to z = +2.0 and a score of X=61 corresponds to z = -1.00.

Q18. Find the mean for the population Q19. Find the standard deviation (σ) for the population Q20. What score (X) corresponds to a z = +0.8? Q21. What score (X) corresponds to z =...

# how do i find the answer

The average time it takes college freshmen to complete the Mason Basic Reasoning Test is 24.6 minutes. The standard deviation is 5.8 minutes. Assume the variable is normally distributed. Find the...

# how do i find this answer

During September, the average temperature of Laurel Lake is 64.2° and the standard deviation is 3.2°. Assume the variable is normally distributed. For a randomly selected day in September, find the...

# The mean consumption of beef at the turn of the century was 70 pounds per person per year in the US. A sample of 32 people taken this year yielded the followin

The mean consumption of beef at the turn of the century was 70 pounds per person per year in the US.  A sample of 32 people taken this year yielded the following data, in pounds, on last years...

# If a hypothesis test is used to evaluate the effect of the treatment, which combination of factors is most likely to result in rejecting the null hypothesis?

A researcher administers a treatment to a sample of participants selected from a population with µ = 80. If a hypothesis test is used to evaluate the effect of the treatment, which combination of...

TRUE OR FALSE ?

# If the null hypothesis is true and you run a z-score test using the .05 level of significance, what is the probability that you will make a Type I error?

1. 0.05 2. 0.95 3. 0 4. between 0 and 0.05 5. not enough information to answer.   I'm guessing it is 0.95

# what is the probability that the sample mean will be greater than m=22

a random sample of n=4 scores is obtained from a normal population with u=20 and o=4. what is the probability that the sample mean will be greater than m=22   wrong answer: 0.3707 is...

# if this student's IQ is reported as a z score , what would the z-score be?

a very bright student is described as having an IQ that is three standard deviations above the mean. if this student's IQ is reported as a z score , what would the z-score be?     1...

# u=76 SD=12, tom scored 8 points below the mean. mary had a score of x=73, and bill had a z score of z=-0.50.

u=76 SD( standard deviation)=12, tom scored 8 points below the mean. mary had a score of x=73, and bill had a z score of z=-0.50. place these three students in order from lowest to highest score   lowest middle  highest    wrong...

# Need help with statistic Question (Please Show all steps)

The winner of the 2008-2009 NBA championship was the LA Lakers. One starting lineup for that team is shown in the following table:   Player             ...