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IgorLugansk [536]
3 years ago
9

An independent-samples t test was conducted to compare high-altitude exercise to exercise at sea-level. Imagine the mean comfort

level of participants, rated on a 7-point scale where high values reflect high comfort, at high altitude was 3.5 while the average at sea-level was 5.1. Imagine also that values were calculated for sdifference of 1.1, 2.04 for pooled variance, and 35 for degrees of freedom total. What are the critical cutoffs for this test
Mathematics
1 answer:
insens350 [35]3 years ago
7 0

Answer:

-2.03, 2.03

Step-by-step explanation:

The degree of freedom (df) ;

Df total for the two samples = 35

Therefore, obtuaking the critical value using a T-test distribution at 95% confidence level.

(1 - 95%) / 2 = (1 - 0.95) / 2 = 0.05 / 2 = 0.025

Using a T critical value calculator or t table distribution ;

Tcritical, 0.025, df = 35 = 2.03

Left tail = - 2.03

Right = 2.03

Hence, critical cutoff :

(-2.03 ; 2.03)

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Jon’s test grades are 67,75,73 and 69. What does he need to make on his next test to have a 73 average?
melisa1 [442]

Answer:

he must score 69,75,73and69

Step-by-step explanation:

in order to get average 73

8 0
4 years ago
A,64.25+35.25+25
emmasim [6.3K]

Answer:

I don't really understand but Hope's this helps

Step-by-step explanation:

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8 0
3 years ago
Hannaford sells two sizes of cheerios cereal. The smaller box contains 9 ounces and
svlad2 [7]

Quantity of cheerios cereal in the smaller box Hannaford sold = 9 ounces

Cost of nine ounces of cheerios cereal = $2.50

Cost of one ounce of cheerios cereal :

= 2.50 \: \div  \: 9

=\color{plum}\$ 0.27

Cost of one ounce of cheerios cereal in the smaller box = $0.27

Quantity of cheerios cereal in the larger box Hannaford sold = 20 ounces

Cost of nine ounces of cheerios cereal = $3.79

Cost of one ounce of cheerios cereal :

= 3.79 \div 20

=\color{plum} \$0.18

Cost of one ounce of cheerios cereal in the larger box = $0.18

Difference in their cost per ounce :

= 0.27 - 0.18

=\color{plum}\bold{\$ 0.09}

Therefore, the difference in cost in dollars per ounce between the two sizes = $0.09

7 0
3 years ago
List the members of these sets.
Rina8888 [55]
<span>a.{x | x is a real number such that x^2 = 1}

x^2 = 1 => x = +/- 1

=> {-1, 1} <------ answer

b.{x | x is a positive integer less than 12}

1 ≤ x < 12 => {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11} <------ answer

c.{x | x is the square of an integer and x < 100}

x = n^2 < 100 => n^2 - 100 < 0

=> (n - 10) (n + 10) < 0

=> a) n - 10 > 0 and n + 10 < 0  => n > 10 and n < - 10 which is not possible

b) n - 10 < 0 and n + 10 > 0 => n < 10 and n > - 10 => - 10 < n < 10

=> n = { - 9, - 8, - 7, - 6, - 5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9}

=> x = {0, 1, 4, 9, 16, 25, 36, 49, 64, 81} <---- answer

d.{x | x is an integer such that x^2 = 2} </span>

x =  {∅ } because x is √2 which is not an interger but an irrational number

=> Answer: { ∅ }
8 0
3 years ago
A mountain climber explored a cliff that is 225 yards high in 5 equal descents. How many yards was one descent?
Montano1993 [528]
So if the cliff is 225 yard in height and he want to make it down in 5 equall decents
that means that each dessent is 1/5 of 225 or 225/5
225=125 times 5 so if you divied 225 by 5 then you get 125
so each dessent is 125 yards
7 0
4 years ago
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