Questions from Business Statistics

Q: Multiple sclerosis (MS) is an autoimmune disease that strikes more

Multiple sclerosis (MS) is an autoimmune disease that strikes more often the farther people live from the equator. Could vitamin D which most people get from the sun ultraviolet rays be a factor? Rese...

Q: When spending large amounts to purchase advertising time, companies want to

When spending large amounts to purchase advertising time, companies want to know what audience they’ll reach. In January 2011, a poll asked 1008 American adults whether they planned to watch the upcom...

Q: Researchers studied the herb black cohosh as a treatment for hot flashes

Researchers studied the herb black cohosh as a treatment for hot flashes caused by menopause. They randomly assigned 351 women aged 45 to 55 who reported at least two hot flashes a day to one of five...

Q: Coffee stations in offices often just ask users to leave money in

Coffee stations in offices often just ask users to leave money in a tray to pay for their coffee, but many people cheat. Researchers at Newcastle University replaced the picture of flowers on the wall...

Q: Over a 4-month period, among 30 people with bipolar

Over a 4-month period, among 30 people with bipolar disorder, patients who were given a high dose (10 g/day) of omega-3 fats from fish oil improved more than those given a placebo. (Archives of Genera...

Q: Among a group of disabled women aged 65 and older who were

Among a group of disabled women aged 65 and older who were tracked for several years, those who had a vitamin B12 deficiency were twice as likely to suffer severe depression as those who did not. (Ame...

Q: In a test of roughly 200 men and women, those with

In a test of roughly 200 men and women, those with moderately high blood pressure (averaging 164/89 mm Hg) did worse on tests of memory and reaction time than those with normal blood pressure. (Hypert...

Q: Is diet or exercise effective in combating insomnia? Some believe that

Is diet or exercise effective in combating insomnia? Some believe that cutting out desserts can help alleviate the problem, while others recommend exercise. Forty volunteers suffering from insomnia ag...

Q: After menopause, some women take supplemental estrogen. There is some

After menopause, some women take supplemental estrogen. There is some concern that if these women also drink alcohol, their estrogen levels will rise too high. Twelve volunteers who were receiving sup...

Q: The correlation between Age and Income as measured on 100 people is

The correlation between Age and Income as measured on 100 people is r=0.75. Explain whether or not each of these possible conclusions is justified: 1. When Age increases, Income increases as well. 2....