Test 4 Review

A public health administrator wants to estimate the average age of Utah residents who have had Covid-19. To do this, she takes a simple random sample of 1000 Utah residents from all of those who have tested positive for Covid-19 and finds out their ages. What is the parameter?

• The average age of the 1000 Utah residents who tested positive for Covid-19.

• The average number of all Utah residents who have had Covid-19

• The average age of all Utah residents who have had Covid-19.

• The average number of the 1000 Utah residents who tested positive for Covid-19.

A public health administrator wants to estimate the average age of Utah residents who have had Covid-19. To do this, she takes a simple random sample of 1000 Utah residents from all of those who have tested positive for Covid-19 and finds out their ages. What is the statistic?

• The average age of the 1000 Utah residents who tested positive for Covid-19.

• The average age of all Utah residents who have had Covid-19.

• The average number of all Utah residents who have had Covid-19

• The average number of the 1000 Utah residents who tested positive for Covid-19.

A gambler will play roulette 50 times, betting a dollar on four joining numbers each time. If one of these four numbers comes up, she gets the dollar back, together with winnings of $8.  If any other number comes up, she loses the dollar.  So this bet pays 8 to 1, and there are 4 chances in 38 of winning.  Her net gain in 50 plays is like the sum of (BLANK) draws from the box (BLANK). Fill in the blanks.

• 4

  A box with 4 $8's and one -$38

• 38

  A box with 4 $8's and 38 -$1's

• 5.26

  A box with one $32 and one $34

• 50

  A box with 4 $8's and 34 -$1's

In a game of chance, a player rolls a 6-sided die. If the die lands on a 1 or a 2, the player loses $5, if it lands on a 3 or 4 they lose $2, if it lands on a 5 they win $2, and if it lands on a 6 they win $10. The amount of money the player wins if they play the game 400 times is like the sum of 400 draws from which of the following boxes?

• 
• 
• 
• 

If we look at the sum of 10 draws from a box, the probability histogram for the sum of the draws will follow the normal curve even if the histogram for the tickets in the box is far from the normal curve.

• True

• False

The probability histogram for the sum of the draws will be close to the normal curve even if the tickets in the box do not follow the normal curve, as long as the number of draws is large enough.

• True

• False

A die is rolled, and you win $100 if the die is 6 more than 20% of the time. Which is better, 10 rolls or 100 rolls?

• 10 rolls

• 100 rolls

A die is rolled, and you win $100 if the die reads 6 more than 15% of the time. Which is better, 10 rolls or 100 rolls?

• 100

• 10

A die is rolled, and you win $100 if the die is 6 between 15% and 18% of the time. Which is better, 10 rolls or 100 rolls?

• 10

• 100

A die is rolled, and you win $100 if the die is 6 EXACTLY 16.67% of the time. Which is better, 10 rolls or 100?

• 10

• 100