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Naddik [55]
3 years ago
7

The choice between a z-test and a t-test for a population mean depends primarily on:

Mathematics
1 answer:
Tom [10]3 years ago
6 0
Z-test should be used when the parent standard deviation is known and the sample size is greater than or equal to 30 (to satisfy the Central Limit Theorem). A T-test should be used when these two rules do not apply.
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Please help ASAP!!! Compare 147% of 621 to 125% of 549! I will give 10 pts
oksano4ka [1.4K]

Answer:

A.) 147% out of 621 is 974.97 or 975

B.) 125% out of 549 is 686.25 or 686

Therefor option A has the largest outcome, and option B has the lowest outcome.

<em>If you liked the answer a brainliest would help a lot! Have a good day!</em>

6 0
3 years ago
Kayla's father throws Kayla a graduation party that costs $775. He pays the DJ $250, $75 for the cake, and $5 per party guest fo
Charra [1.4K]

Answer:

90 people

Step-by-step explanation:

Total: $775

DJ: $250

Cake: $75

Unknown party guests each getting $5

Let the unknown be x

We can form an equation; <em>DJ + Cake + x number of party guests = $775</em>

<em>250 + 75 + 5x = 775</em>

<em>325 + 5x = 775</em>

Subtract 325 from <u>both sides of the equals sign</u>.

<em>5x = 450</em>

Make <em>x</em> the subject and divide both sides by 5

<em>x = 90</em>

There were 90 party guests.

7 0
4 years ago
Find the volume of the sphere.
erastovalidia [21]

Answer:

268 units³

Step-by-step explanation:

V = 4/3 (pi)r³

V = 4/3 (3.14) (4³)

V = 4/3 (3.14) (64)

V = 4/3 (200.96)

V = 268

7 0
3 years ago
-52 times the difference a number and 97 is equal to the number plus 39
VLD [36.1K]
-52 (x - 97) = x + 39

-52x + 5,044 = x + 39
+52x              +52x

5,044 = 53x + 39
-39               - 39

5,005 = 53x
____    ____
53x       53x

94.43 = x
8 0
3 years ago
Bernie's Pizza sells pizza by the slice for lunch. An employee recorded how many slices of each type of pizza were sold today. p
elena-s [515]

Answer:

i cant understand it brief it plz

4 0
3 years ago
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