a chessboard has 64 squares at a chess tournament 84 chessboards were used how many squares are there on 85 chessboards
2 answers:
Answer:
5,440 squares.
Step-by-step explanation:
We have been given that a chessboard has 64 squares. At a chess tournament 84 chessboards were used.
To find the number of squares on 85 chessboards, we will multiply number of squares on each chess board by number of total chess boards.
Therefore, there are 5440 squares on 85 chess boards.
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Answer:
Null and alternative hypothesis
Test statistic
P-value
The null hypothesis is rejected.
It is concluded that the proportion of households tuned into the program is less than 25%. The claim of the advertiser is rigth and got statistical support.
Step-by-step explanation:
We have to perform a hypothesis test of a proportion.
The claim is that less than 25% were tuned into the program, so we will state this null and alternative hypothesis:
The signifiance level is 0.01.
The sample has a proportion p=0.1 and sample size of n=6000.
The standard deviation of the proportion, needed to calculate the test statistic, is:
The test statistic is calculated as:
As this is a one-tailed test, the P-value is P(z<-26.82)=0. The P-value is smaller than the significance level (0.01), so the effect is significant.
Since the effect is significant, the null hypothesis is rejected. It is concluded that the proportion of households tuned into the program is less than 25%. The claim of the advertiser is rigth and got statistical support.