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r-ruslan [8.4K]
2 years ago
13

A lorry drives for 4 hours at a speed of 45 mph. Calculate how far it travles

Mathematics
2 answers:
Delvig [45]2 years ago
6 0

Answer:

180 miles

Step-by-step explanation:

Distance = speed x time

45 x 4 =180miles

Leona [35]2 years ago
4 0
Distance = 180
distance = speed x time
distance = 4 x 45
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A zoologist is studying four very closely related feline species. She wishes to compare their gestation periods. An observationa
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p_v= 0.01

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Previous concepts

Analysis of variance (ANOVA) "is used to analyze the differences among group means in a sample".  

The sum of squares "is the sum of the square of variation, where variation is defined as the spread between each individual value and the grand mean"  

Solution to the problem

The hypothesis for this case are:

Null hypothesis: \mu_{A}=\mu_{B}=\mu_{C}= \mu_D

Alternative hypothesis: Not all the means are equal \mu_{i}\neq \mu_{j}, i,j=A,B,C,D

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SS_{total}=\sum_{j=1}^p \sum_{i=1}^{n_j} (x_{ij}-\bar x)^2  

SS_{between}=SS_{model}=\sum_{j=1}^p n_j (\bar x_{j}-\bar x)^2  

SS_{within}=SS_{error}=\sum_{j=1}^p \sum_{i=1}^{n_j} (x_{ij}-\bar x_j)^2  

And we have this property  

SST=SS_{between}+SS_{within}  

And in order to test this hypothesis we need to ue an F statistic and for this case the p value calculated is

p_v= 0.01

Since the significance level is 0.05 we see that pv so we have enough evidence to reject the null hypothesis. And the best conclusion for this case would be:

b. at least some, but not all, of the gestation periods across all four species are the same

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