Which of the following threats to internal validity would be of concern if an outbreak of salmonella in peanut butter occurred while a study was being conducted on perceptions of peanut butter?
a. maturation
b. regression to the mean
c. history
d. placebo
C
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The trade deficit is the difference between the value of goods and services that a country buys from overseas and the value of goods and services it sells to other countries
Indicate whether this statement is true or false.
Minor political parties in the state prefer the office-block ballot because it
A) makes voting easier. B) makes straight-ticket voting for the major parties more difficult. C) makes the major parties more accountable. D) encourages voting.
Which amendment was repealed by Congress, after the Prohibition that it enacted was an utter failure?
A) the Twenty-Second Amendment B) the Tenth Amendment C) the Thirtieth Amendment D) the Thirteenth Amendment E) the Eighteenth Amendment
Explain the role of the supreme leader in Iran
What will be an ideal response?