Improved memory and problem-solving skills

Assignment Help Basic Statistics
Reference no: EM1393884

A health magazine recently reported a study in which researchers claimed that iron supplements increased memory and problem-solving abilities in a random sample of college women. All of the women took memory and problem-solving tests at the beginning of the study, then took iron supplements, and then took the same tests again at the end of the study. What is wrong with this design? What confounds could be leading to the results of improved memory and problem-solving skills?

Reference no: EM1393884

Questions Cloud

Did linda express, implied or apparent authority to sell : Jack runs a baseball card shop. Linda, who knows little or nothing about baseball or baseball cards, agrees to run the shop for Jack while he went out for dinner. Jack provides Linda the following instructions.
Market value and book value : Superior Medical System's 2005 balance sheet showed total common equity of $2,050,000. The company had 100,000 shares of stock outstanding which sold at a price of $57.25 per share.
What is the bonferroni adjustment : What is the Bonferroni adjustment? What would the Bonferroni adjustment be for a study with four groups for which a researcher decided to use t-tests?
Illustrate what roles did you play in the meeting : Analyse a meeting you have attended. This could be a work, study or sporting group meeting. Answer the following questions also submit no more than one page single spaced on your find outings. Your responses should be full sentences.
Improved memory and problem-solving skills : What is wrong with this design? What confounds could be leading to the results of improved memory and problem-solving skills?
Calculating taxable income : Madison Metals recently reported $9,000 of sales, $6,000 of operating costs other than depreciation, and $1,500 of depreciation. The company had no amortization charges and no non-operating income.
Product of an independent fertilization event : The seeds in bush bean pods are each the product of an independent fertilization event. Green seed color is dominant to white seed color in bush beans.
Process mean and standard deviation : If the process mean and standard deviation remain constant, what proportion of the output from this process will be defective?
Predictors of job performance are correlated with ksaos : Indicator's of a person's degree of success in past situations should be predictive of future job success.

Reviews

Write a Review

Basic Statistics Questions & Answers

  Chi-square test for independence of attributes

Chi-square test for independence of attributes - Describe why a x 2  test of the resulting contingency table is appropriate for such an investigation.

  Find the probability based on poisson distribution

On average a certain intersection results in 3 traffic accidents per month. What is the probability that for any given month at this intersection

  Explaining relationship between total gross-opening gross

Explain the relationship between total gross and opening gross total gross and number of theatres  total gross and week in top 60.

  Federal minimum wage

The Federal minimum wage is $7.25 (effective July 2009). If an employee earns the new minimum wage, how many complaints can that employee expect to receive?

  Solution utilizing graphical method

Solution utilizing graphical method. Compute the following linear programming problem. Among which of the following points (X, Y) is not a feasible corner point.

  Strong negative relationship-pf income and mental illness

Draw a scatterplot indicating a strong negative relationship between the variables pf income and mental illness. Be sure to label the axes correctly.

  Significance level-population mean weight of athletic men

Can we conclude at the 5% significance level that the population mean weight of athletic men is lower than the population mean weight of non-athletic men?

  Standard deviation of normal distribution

Suppose 94 percent of the items have lives exceeding 2000 h and 3.51 percent have lives exceeding 16,240 h. Find the mean and standard deviation of the service life.

  Confidence interval estimation

Your statistics instructor wants you to determine a confidence interval estimate for the mean test score for the next exam.

  What is the probability that the student 30 years old

Professor Cox needs a volunteer amongst 30 students in his statistical applications course. The average age of his students is 25 years, with the standard deviation of 3 years.

  Initial perception of the information

What is your initial perception of this information? What are other ways, beyond looking at the p-value alone, you could use to try to interpret what this outcome of r(2398) = -.21 tells us about the relationship between length of time taking drug..

  Identify the type of sampling used

Recognize the kind of sampling (random, systematic, convenience, stratified, cluster) employed whenever a sample of people who smoke is obtained as explained below.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd