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jasenka [17]
3 years ago
11

A researcher is looking at the impact that television has on children. Children are placed in a room with a variety of toys and

a television playing a cartoon. The researcher predicts that the children will spend more than half of their 30 minutes looking at the television. The researcher tested 15 children and found a sample mean of M= 17 minutes spent watching the television with SS = 79. In order to test this hypothesis, what does the researcher need?a. A one-tailed z-score b. A two-tailed z-score c. A one-tailed t statistic d. A two-tailed t statistic
Mathematics
1 answer:
Xelga [282]3 years ago
6 0

Answer:

c.  A one-tailed t statistic

Step-by-step explanation:

firstly; sample size n < 30 we use a t-test

A t-test is necessary for small samples because their distributions are not normal.

Also One-tailed tests have more statistical power to detect an effect in one direction

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professor190 [17]

Step-by-step explanation:

please mark the brainiest

4 0
3 years ago
Fatima is on the track team. One day at practice, it took her 19 minutes to run 2 miles. Select the expression that gives this a
monitta

Answer:

Fatima's unit rate is 9.5 minutes per mile.

Step-by-step explanation:

To compute the one unit value of a variable divide the total values of <em>n</em> variables by <em>n</em>.

It is provided that it took Fatima 19 minutes to run 2 miles.

Then the unit rate at which Fatima runs is:

\text{Unit Rate}=\frac{19}{2}

                =9.5

Thus, Fatima's unit rate is 9.5 minutes per mile.

5 0
3 years ago
Which shows two expressions that are equivalent to (Negative 7) (Negative 15) (Negative 5) Yan is climbing down a ladder. Each t
Svet_ta [14]

Answer:

(-8) + (-8) + (-8) + (-8)

Step-by-step explanation:

Since Yan is descending ; we represent his movement as being negative.

Number of rungs descended before stopping = 4

Number of stops = 8

Given that no extra steps was taken ;

Number of ladder rungs descended :

4 rungs per stop for 8 stops

- 4 * 8 = - 32 rungs

Another way to write the product :

Number of stops added in number of rungs descended :

(-8) + (-8) + (-8) + (-8)

3 0
3 years ago
Write the equation of a line that is parallel to y = 1/2x - 4 and that passes through the point (9, -6)
timofeeve [1]
//To have the lines parallel, the gradients must be the same.

y -- 6 = 1/2 (x - 9)
y + 6 = 1/2 x -9/2
y = 1/2 x - 10.5
7 0
3 years ago
Can u please help me with this math assignment
Troyanec [42]
Hard to read sideways but what I got from that is that you have a right triangle and you are trying to explain the other angles? 
Both of the other two angles would be 45 because an angle is 180 total. If it is a right angle, that means that there is a 90 degree angle. 180-90=90. In a right angle, the other two angles are the same in degree. Therefor 90/2 is 45. 45 applies to both of the acute angles. I hope this helps! Good luck :)
6 0
3 years ago
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